This user manual describes several products. This means you may find instructions that aren’t applicable to your product.
Solution overview
AXIS P3235–LV
AXIS P3235–LVE
Surveillance center
Audio out
Audio in
This is an example of how the products can be installed and used. The products can be connected to a speaker via audio out and a microphone via audio in, which makes it possible to watch, listen and broadcast information from the surveillance center.
Product overview
Network connector (PoE)
SD memory card slot
Status LED indicator
Control button
Audio
I/O
Find the device on the network
To find Axis devices on the network and assign them IP addresses in Windows®, use AXIS IP Utility or AXIS Device Manager. Both applications are free and can be downloaded from axis.com/support.
Axis devices send the initially set password in clear text over the network. To protect your device after the first login, set up a secure and encrypted HTTPS connection and then change the password.
The device password is the primary protection for your data and services. Axis devices do not impose a password policy as they may be used in various types of installations.
To protect your data we strongly recommend that you:
Use a password with at least 8 characters, preferably created by a password generator.
Don’t expose the password.
Change the password at a recurring interval, at least once a year.
Set a new password for the root account
Important
The default administrator username is root. If the password for root is lost, reset the device to factory default settings. See Reset to factory default settings
Support tip: Password security confirmation check
Type a password. Follow the instructions about secure passwords. See Secure passwords.
Retype the password to confirm the spelling.
Click Create login. The password has now been configured.
Webpage overview
Live view control bar
Live view
Product name
User information, color themes, and help
Video control bar
Settings toggle
Settings tabs
Additional settings
Image quality
Capture modes
A capture mode is a preset configuration that defines how the camera will capture images. The capture mode setting can affect the camera’s field of view and aspect ratio. The shutter speed can also be affected, which in turn will affect the light sensitivity.
The lower resolution capture mode may be sampled from the original resolution, or it may be cropped out from the original, in which case the field of view may also be affected.
The image shows how the field of view and aspect ratio can change between two different capture modes.
The capture mode to choose depends on the requirements for the frame rate and resolution for the specific surveillance setup. For specifications about available capture modes, see the product’s datasheet at axis.com.
Select capture mode
Which capture mode to choose depends on the requirements of frame rate and resolution for the specific surveillance setup. For specifications about available capture modes, see the product’s datasheet. To find the latest version of the datasheet, go to axis.com.
Adjust the zoom and focus
To adjust the zoom:
Go to Settings > Image > Zoom and use the slider to adjust the zoom.
To adjust the focus:
Go to Settings > Image > Focus and click Show AF area.
Adjust the autofocus area to cover the part of the image that you want to be in focus.
If you don’t select an autofocus area, the camera focuses on the entire scene. We recommend that you focus on a static object.
Click Autofocus.
To fine tune the focus, use the focus slider.
Remote focus and zoom
The remote focus and zoom functionality allows you to make focus and zoom adjustments to your camera from a computer. It is a convenient way to ensure that the scene’s focus, viewing angle and resolution are optimized without having to visit the camera’s installation location.
Benefit from IR light in low-light conditions using night mode
Your camera uses visible light to deliver color images during the day. As the available light diminishes, you can set the camera to automatically shift to night mode, in which the camera uses both visible light and near-infrared light to deliver black-and-white images. Since the camera uses more of the available light it can deliver brighter, more detailed, images.
Go to Settings > Image > Day and night, and make sure that the IR cut filter is set to Auto.
Enable Allow IR illumination and Synchronize IR illumination to use the camera’s IR light when night mode is activated.
Reduce noise in low-light conditions
To reduce noise in low-light conditions, you can adjust one or more of the following settings:
Adjust the trade-off between noise and motion blur. Go to Settings > Image > Exposure and move the Blur-noise trade-off slider toward Low noise.
Note
A high max shutter value can result in motion blur.
To slow down the shutter speed, set max shutter to the highest possible value.
Reduce sharpness in the image.
Note
When you reduce the max gain, the image can become darker.
Set the max gain to a lower value.
Open the aperture.
Handle scenes with strong backlight
Dynamic range is the difference in light levels in an image. In some cases the difference between the darkest and the brightest areas can be significant. The result is often an image where either the dark or the bright areas are visible. Wide dynamic range (WDR) makes both dark and bright areas of the image visible.
Image without WDR.Image with WDR.
Note
WDR can cause artifacts in the image.
WDR may not be available for all capture modes.
Go to Settings > Image > Wide dynamic range.
Turn on WDR.
Use the Local contrast slider to adjust the amount of WDR.
If you still have problems, go to Exposure and adjust the Exposure zone to cover the area of interest.
To verify that a defined part of the image contains enough pixels to, for example, recognize the face of a person, you can use the pixel counter.
Go to Settings > System > Orientation.
Click .
In the camera’s live view, adjust the size and position of the rectangle around the area of interest, for example where you expect faces to appear.
You can see the number of pixels for each of the rectangle’s sides (X and Y), and decide if the values are enough for your needs.
View area
A view area is a cropped part of the full view. You can stream and store view areas instead of the full view to minimize bandwidth and storage needs. If you enable PTZ for a view area, you can pan, tilt and zoom within it. By using view areas you can remove parts of the full view, for example, the sky.
When you set up a view area, we recommend you to set the video stream resolution to the same size as or smaller than the view area size. If you set the video stream resolution larger than the view area size it implies digitally scaled up video after sensor capture, which requires more bandwidth without adding image information.
Privacy masks
A privacy mask is a user-defined area that prevents users from viewing a part of the monitored area. In the video stream, privacy masks appear as blocks of solid color or blurred image elements.
You’ll see the privacy mask on all snapshots, recorded video, and live streams.
You can use the VAPIX® application programming interface (API) to turn off the privacy masks.
Important
If you use multiple privacy masks it may affect the product’s performance.
Important
Set the zoom and focus before you create a privacy mask.
Hide parts of the image with privacy masks
You can create one or several privacy masks to hide parts of the image.
How to create a privacy mask
Go to Settings > Privacy mask.
Click New.
Adjust the size, color, and name of the privacy mask according to your needs.
How to change the appearance of the mask
Overlays
Overlays are superimposed over the video stream. They are used to provide extra information during recordings, such as a timestamp, or during product installation and configuration. You can add either text or an image.
Show a text overlay in the video stream when the device detects motion
This example explains how to display the text “Motion detected” when the device detects motion.
How to show text overlay when the camera detects motion
Make sure that AXIS Video Motion Detection is running:
Go to Settings > Apps > AXIS Video Motion Detection.
Start the application if it is not already running.
Make sure you have set up the application according to your needs.
Add the overlay text:
Go to Settings > Overlay.
Enter #D in the text field.
Choose text size and appearance.
Create a rule:
Go to System > Events > Rules and add a rule.
Type a name for the rule.
In the list of conditions, select AXIS Video Motion Detection.
In the list of actions, select Use overlay text.
Select Camera 1.
Type “Motion detected”.
Set the duration.
Click Save.
Streaming and storage
Video compression formats
Decide which compression method to use based on your viewing requirements, and on the properties of your network. The available options are:
Motion JPEG
Motion JPEG, or MJPEG, is a digital video sequence that is made up of a series of individual JPEG images. These images are then displayed and updated at a rate sufficient to create a stream that shows constantly updated motion. For the viewer to perceive motion video the rate must be at least 16 image frames per second. Full motion video is perceived at 30 (NTSC) or 25 (PAL) frames per second.
The Motion JPEG stream uses considerable amounts of bandwidth, but provides excellent image quality and access to every image contained in the stream.
H.264 or MPEG-4 Part 10/AVC
Note
H.264 is a licensed technology. The Axis product includes one H.264 viewing client license. To install additional unlicensed copies of the client is prohibited. To purchase additional licenses, contact your Axis reseller.
H.264 can, without compromising image quality, reduce the size of a digital video file by more than 80% compared to the Motion JPEG format and by as much as 50% compared to older MPEG formats. This means that less network bandwidth and storage space are required for a video file. Or seen another way, higher video quality can be achieved for a given bitrate.
Reduce bandwidth and storage
Important
If you reduce the bandwidth it can result in loss of details in the picture.
Go to live view and select H.264.
Go to Settings > Stream.
Do one or more of the following:
Turn on dynamic GOP and set a high GOP length value.
Increase the compression.
Turn on dynamic FPS.
Set up network storage
To store recordings on the network, you need to set up your network storage.
Go to Settings > System > Storage.
Click Setup under Network storage.
Enter the IP address of the host server.
Enter the name of the shared location on the host server.
Move the switch if the share requires a login, and enter username and password.
Click Connect.
Add audio to your recording
Turn on audio:
Go to Settings > Audio and turn on Allow audio.
Go to Input > Type and select your audio source.
Edit the stream profile which is used for the recording:
Go to Settings > Stream and click Stream profiles.
Select the stream profile and click Audio.
Select the checkbox and select Include.
Click Save.
Click Close.
Record and watch video
To record video you must first set up network storage, see Set up network storage, or have an SD card installed.
Record video
Go to the live view.
To start a recording, click Record. Click again to stop the recording.
Watch video
Click Storage > Go to recordings.
Select your recording in the list and it will play automatically.
Bitrate control
Bitrate control helps you to manage the bandwidth consumption of your video stream.
Variable bitrate (VBR)Variable bitrate allows the bandwidth consumption to vary depending on the level of activity in the scene. The more activity, the more bandwidth you need. With variable bitrate you are guaranteed constant image quality, but you need to make sure you have storage margins.
Maximum bitrate (MBR)Maximum bitrate lets you set a target bitrate to handle bitrate limitations in your system. You might see a decline in image quality or frame rate as the instantaneous bitrate is kept below the specified target bitrate. You can choose to prioritize either image quality or frame rate. We recommend that you configure the target bitrate to a higher value than the expected bitrate. This gives you a margin in case there is a high level of activity in the scene.
Target bitrate
Average bitrate (ABR)With average bitrate, the bitrate is automatically adjusted over a longer period of time. This is so you can meet the specified target and provide the best video quality based on your available storage. Bitrate is higher in scenes with a lot of activity, compared to static scenes. You are more likely to get better image quality when in scenes with a lot of activity if you use the average bitrate option. You can define the total storage required to store the video stream for a specified amount of time (retention time) when image quality is adjusted to meet the specified target bitrate. Specify the average bitrate settings in one of the following ways:
To calculate the estimated storage need, set the target bitrate and the retention time.
To calculate the average bitrate, based on available storage and required retention time, use the target bitrate calculator.
Target bitrate
Actual average bitrate
You can also turn on maximum bitrate and specify a target bitrate within the average bitrate option.
Target bitrate
Actual average bitrate
Events
Set up rules for events
You can create rules to make your device perform an action when certain events occur. A rule consists of conditions and actions. The conditions can be used to trigger the actions. For example, the device can start a recording or send an email when it detects motion, or show an overlay text while the device is recording.
Go to Settings > System > Events to set up a rule. The rule defines when the device will perform certain actions. Rules can be setup as scheduled, recurring, or for example, triggered by motion detection.
Select the Condition that must be met to trigger the action. If you specify more than one condition for the rule, all of the conditions must be met to trigger the action.
Select which Action the device should perform when the conditions are met.
Note
If you make changes to an active rule, you have to restart the rule for the changes to take effect.
Record video when the camera detects motion
This example explains how to set up the camera to start recording to the SD card five seconds before it detects motion and to stop one minute after.
How to record a video stream when the camera detects motion
Make sure that AXIS Video Motion Detection is running:
Go to Settings > Apps > AXIS Video Motion Detection.
Start the application if it is not already running.
In the list of conditions, under Application, select AXIS Video Motion Detection (VMD).
In the list of actions, under Recordings, select Record video while the rule is active.
Select an existing stream profile or create a new one.
Set the prebuffer time to 5 seconds.
Set the postbuffer time to 60 seconds.
In the list of storage options, select SD card.
Click Save.
Record video when a PIR detector senses motion
This example explains how to connect an Axis PIR detector to the camera, and set up the camera to start recording when the detector senses motion.
Required hardware
3-wire cable (ground, power, I/O)
Axis PIR detector
NOTICE
Disconnect the camera from power before connecting the wires. Reconnect to power after all connections are done.
Connect the wires to the camera’s I/O connector
Note
For information on the I/O connector, see Connectors.
Connect the ground wire to pin 1 (GND/-).
Connect the power wire to pin 2 (12V DC output).
Connect the I/O wire to pin 3 (I/O input).
Connect the wires to the PIR detector’s I/O connector
Connect the other end of the ground wire to pin 1 (GND/-).
Connect the other end of the power wire to pin 2 (DC input/+).
Connect the other end of the I/O wire to pin 3 (I/O output).
Configure the I/O port in the camera’s webpage
Go to Settings > System > I/O ports.
Give the input module a descriptive name.
To make the PIR detector send a signal to the camera when it senses motion, select Closed circuit in the drop-down list.
To trigger the camera to start recording when it receives a signal from the PIR detector, you need to create a rule in the camera’s webpage.
Record video when the camera detects loud noises
This example explains how to set up the camera to start recording to the SD card five seconds before it detects loud noise and to stop one minute after.
Go to Settings > System > Detectors > Audio detection.
Adjust the alarm level according to your needs.
Create a rule:
Go to Settings > System > Events and add a rule.
Type a name for the rule.
In the list of conditions, under Audio, select Audio Detection.
In the list of actions, under Recordings, select Record video.
Select the stream profile where audio has been turned on.
Set the prebuffer time to 5 seconds.
Set the postbuffer time to 60 seconds.
In the list of storage options, select SD card.
Click Save.
Use audio to deter intruders
This example explains how to connect a speaker to the camera and set it up to play a warning message when the camera detects motion in a restricted area.
Required hardware:
Active speaker with built-in amplifier and connecting wires
NOTICE
Make sure the camera is disconnected from power before making the connections. Reconnect to power after connecting the wires.
Physical connection:
Connect the audio wire to the speaker from the line out pin of the audio connector.
Connect the grounding wire to the speaker from the GND pin of the audio connector.
Add audio clip to the camera:
Go to Settings > Audio > Output and click .
Click Upload new clip.
Browse to locate your audio clip and click Done.
Create a rule:
Open the device webpage for the camera.
Go to Settings > System > Events.
Go to Recipients and add a recipient.
Go to the device webpage of the speaker that has the audio clip stored on its SD card.
Copy a link to the audio clip.
Return to the device webpage of the camera.
Go to Rules and add a new rule:
Under Condition, select Video motion detection.
Under Action, select Send notification through HTTP.
Detect tampering with input signal
This example explains how to trigger an alarm when the input signal has been cut or short-circuited. For more information about the I/O connector, see I/O connector.
How to send an email notification when someone tampers with the input signal
Go to Settings > System > I/O Ports and turn on Supervised I/O.
Create a rule:
Go to Settings > System > Events and add a rule.
Type a name for the rule.
In the list of conditions, select Digital input and then select a port.
In the list of actions, select Send notification to email and then select a recipient from the list. Go to Recipients to create a new recipient.
To create a new recipient, click . To copy an existing recipient, click .
Type a subject and a message for the email.
Click Save.
Send an email automatically if someone spray paints the lens
How to send an email notification if someone spray paint the lens
Go to Settings > System > Detectors.
Turn on Trigger on dark images. This will trigger an alarm if the lens is sprayed, covered, or rendered severely out of focus.
Set a duration for Trigger after. The value indicates the time that must pass before an email is sent.
Create a rule:
Go to Settings > System > Events > Rules and add a rule.
Type a name for the rule.
In the list of conditions, select Tampering.
In the list of actions, select Send notification to email.
Select a recipient from the list or go to Recipients to create a new recipient.
To create a new recipient, click . To copy an existing recipient, click .
Type a subject and a message for the email.
Click Save.
Applications
AXIS Camera Application Platform (ACAP) is an open platform that enables third parties to develop analytics and other applications for Axis products. To find out more about available applications, downloads, trials and licenses, go to axis.com/applications.
To find the user manuals for Axis applications, go to help.axis.com.
Note
Several applications can run at the same time but some applications might not be compatible with each other. Certain combinations of applications might require too much processing power or memory resources when run in parallel. Verify that the applications work together before deployment.
How to download and install an application
How to activate an application licence code on a device
AXIS People Counter
AXIS People Counter is an analytic application that you can install on a network camera. You can use the application to count how many people pass through an entrance, in what direction they pass, and if more than one person passes during a predefined interval. You can also use it to estimate how many people are currently occupying an area, and the average visiting time.
The application runs embedded in the camera which means you don’t need a dedicated computer to run the application. AXIS People Counter is suitable for any indoor environment, like stores, libraries, or gyms.
How does estimating occupancy work?
You can use the application to estimate occupancy in areas with one or several entrances and exits. Each entrance and exit needs to be equipped with a network camera with AXIS People Counter installed. If there are several cameras, they communicate with each other over the network in a primary and secondary concept. The primary camera continuously fetches data from the secondary cameras and presents the data in the live view. Every fifteen minutes, the primary camera sends the statistical data to AXIS Store Data Manager. Consequently, the reports generated from AXIS Store Data Manager can present the data in a minimum of 15 minutes time interval.
Troubleshooting
Reset to factory default settings
WARNING
IR emitted from this product. Do not look at operating lamp.
Important
Reset to factory default should be used with caution. A reset to factory default resets all settings, including the IP address, to the factory default values.
To reset the product to the factory default settings:
Disconnect power from the product.
Press and hold the control button while reconnecting power. See Product overview.
Keep the control button pressed for 15–30 seconds until the status LED indicator flashes amber.
Release the control button. The process is complete when the status LED indicator turns green. The product has been reset to the factory default settings. If no DHCP server is available on the network, the default IP address is 192.168.0.90.
Use the installation and management software tools to assign an IP address, set the password, and access the video stream.
The installation and management software tools are available from the support pages on axis.com/support.
It is also possible to reset parameters to factory default through the web interface. Go to Settings > System > Maintenance and click Default.
Check the current firmware
Firmware is the software that determines the functionality of network devices. One of your first actions when troubleshooting a problem should be to check the current firmware version. The latest version may contain a correction that fixes your particular problem.
To check the current firmware:
Go to the product’s webpage.
Click the help menu .
Click About.
Upgrade the firmware
Important
Preconfigured and customized settings are saved when the firmware is upgraded (provided that the features are available in the new firmware) although this is not guaranteed by Axis Communications AB.
Important
Make sure the product remains connected to the power source throughout the upgrade process.
Note
When you upgrade the product with the latest firmware in the active track, the product receives the latest functionality available. Always read the upgrade instructions and release notes available with each new release before upgrading the firmware. To find the latest firmware and the release notes, go to axis.com/support/firmware.
Go to Settings > System > Maintenance. Follow the instructions on the page. When the upgrade has finished, the product restarts automatically.
Technical issues, clues and solutions
If you can’t find what you’re looking for here, try the troubleshooting section at axis.com/support.
Problems upgrading the firmware
Firmware upgrade failure
If the firmware upgrade fails, the device reloads the previous firmware. The most common reason is that the wrong firmware file has been uploaded. Check that the name of the firmware file corresponds to your device and try again.
Problems setting the IP address
The device is located on a different subnet
If the IP address intended for the device and the IP address of the computer used to access the device are located on different subnets, you cannot set the IP address. Contact your network administrator to obtain an IP address.
The IP address is being used by another device
Disconnect the Axis device from the network. Run the ping command (in a Command/DOS window, type ping and the IP address of the device):
If you receive: Reply from <IP address>: bytes=32; time=10... this means that the IP address may already be in use by another device on the network. Obtain a new IP address from the network administrator and reinstall the device.
If you receive: Request timed out, this means that the IP address is available for use with the Axis device. Check all cabling and reinstall the device.
Possible IP address conflict with another device on the same subnet
The static IP address in the Axis device is used before the DHCP server sets a dynamic address. This means that if the same default static IP address is also used by another device, there may be problems accessing the device.
The device cannot be accessed from a browser
Cannot log in
When HTTPS is enabled, ensure that the correct protocol (HTTP or HTTPS) is used when attempting to log in. You may need to manually type http or https in the browser’s address field.
If the password for the user root is lost, the device must be reset to the factory default settings. See Reset to factory default settings.
The IP address has been changed by DHCP
IP addresses obtained from a DHCP server are dynamic and may change. If the IP address has been changed, use AXIS IP Utility or AXIS Device Manager to locate the device on the network. Identify the device using its model or serial number, or by the DNS name (if the name has been configured).
If required, a static IP address can be assigned manually. For instructions, go to axis.com/support.
The device is accessible locally but not externally
To access the device externally, we recommend using one of the following applications for Windows®:
AXIS Companion: free of charge, ideal for small systems with basic surveillance needs.
AXIS Camera Station: 30-day trial version free of charge, ideal for small to mid-size systems.
For instructions and download, go to axis.com/vms.
Problems with streaming
Multicast H.264 only accessible by local clients
Check if your router supports multicasting, or if the router settings between the client and the device need to be configured. The TTL (Time To Live) value may need to be increased.
No multicast H.264 displayed in the client
Check with your network administrator that the multicast addresses used by the Axis device are valid for your network.
Check with your network administrator to see if there is a firewall preventing viewing.
Poor rendering of H.264 images
Ensure that your graphics card is using the latest driver. The latest drivers can usually be downloaded from the manufacturer’s website.
Color saturation is different in H.264 and Motion JPEG
Modify the settings for your graphics adapter. Go to the adapter’s documentation for more information.
Reduce the number of applications running on the client computer.
Limit the number of simultaneous viewers.
Check with the network administrator that there is enough bandwidth available.
Lower the image resolution.
Log in to the device’s webpage and set a capture mode that prioritizes frame rate. Changing the capture mode to prioritize frame rate might lower the maximum resolution depending on the device used and capture modes available.
Performance considerations
When setting up your system, it is important to consider how various settings and situations affect the performance. Some factors affect the amount of bandwidth (the bitrate) required, others can affect the frame rate, and some affect both. If the load on the CPU reaches its maximum, this also affects the frame rate.
The following factors are the most important to consider:
High image resolution or lower compression levels result in images containing more data which in turn affects the bandwidth.
Rotating the image in the GUI will increase the product's CPU load.
Access by large numbers of Motion JPEG or unicast H.264 clients affects the bandwidth.
Simultaneous viewing of different streams (resolution, compression) by different clients affects both frame rate and bandwidth.
Use identical streams wherever possible to maintain a high frame rate. Stream profiles can be used to ensure that streams are identical.
Accessing Motion JPEG and H.264 video streams simultaneously affects both frame rate and bandwidth.
Heavy usage of event settings affects the product’s CPU load which in turn affects the frame rate.
Using HTTPS may reduce frame rate, in particular if streaming Motion JPEG.
Heavy network utilization due to poor infrastructure affects the bandwidth.
Viewing on poorly performing client computers lowers perceived performance and affects frame rate.
Running multiple AXIS Camera Application Platform (ACAP) applications simultaneously may affect the frame rate and the general performance.
Shows steady green for 10 seconds for normal operation after startup completed.
Amber
Steady during startup. Flashes during firmware upgrade or reset to factory default.
Amber/Red
Flashes amber/red if network connection is unavailable or lost.
SD card slot
NOTICE
Risk of damage to SD card. Do not use sharp tools, metal objects, or excessive force when inserting or removing the SD card. Use your fingers to insert and remove the card.
Risk of data loss and corrupted recordings. Do not remove the SD card while the product is running. Unmount the SD card from the product’s webpage before removal.
This product supports microSD/microSDHC/microSDXC cards.
microSD, microSDHC, and microSDXC Logos are trademarks of SD-3C LLC. microSD, microSDHC, microSDXC are trademarks or registered trademarks of SD-3C, LLC in the United States, other countries or both.
RJ45 Ethernet connector with Power over Ethernet (PoE).
Audio connector
4-pin white terminal block for audio input and output.
Function
Pin
Notes
GND
1
Ground
Ring power
2
12 V for external source
Microphone/Line in
3
Microphone (analog or digital) or line in (mono). 5 V microphone bias is available.
Line out
4
Line level audio output (mono). Can be connected to a public address (PA) system or an active speaker with a built-in amplifier.
I/O connector
Use the I/O connector with external devices in combination with, for example, motion detection, event triggering, and alarm notifications. In addition to the 0 V DC reference point and power (DC output), the I/O connector provides the interface to:
Digital input
For connecting devices that can toggle between an open and closed circuit, for example PIR sensors, door/window contacts, and glass break detectors.
Supervised input
Enables possibility to detect tampering on a digital input.
Digital output
For connecting external devices such as relays and LEDs. Connected devices can be activated by the VAPIX® Application Programming Interface, trough an event or from the product’s webpage.
4-pin terminal block
Function
Pin
Notes
Specifications
DC ground
1
0 V DC
DC output
2
Can be used to power auxiliary equipment.Note: This pin can only be used as power out.
12 V DCMax load = 25 mA
Digital Input or Supervised Input
3
Connect to pin 1 to activate, or leave floating (unconnected) to deactivate. To use supervised input, install end-of-line resistors. See connection diagram for information about how to connect the resistors.
0 to max 30 V DC
Digital Output
4
Internally connected to pin 1 (DC ground) when active, and floating (unconnected) when inactive. If used with an inductive load, e.g., a relay, connect a diode in parallel with the load, to protect against voltage transients.