My DMS consist of DMM 5.2.x, DMP 4400 and cisco LCD 42. I want to control LCD centrally from my DMM, so i do step to activate "RS 232 for cisco LCD 42" based on this
but, it doesn't success.
Do you have any idea how to activate RS232 in Cisco LCD ?
The link you sent is for the activation of RS232 in an LCD-40 or LCD-52, but I don't know if that's because of a mistake while copying the link or whether you are really following the wrong procedure.
Anyway, the right steps to activate it are the ones described at
If you follow these steps carefully, you should not have any issues with the activation.
Dear Daniel thank u for your reply.
link which you sent is same as my link, i have followed these step in that configuration guide but no result. First i activate RS-232 syntax support :
Step 1 Deploy the System Task event called RS-232: Control supported, non-DMTech displays.
Step 2 Stop. You have completed this procedure.
And then i create new application & play deployment package like in the configuration guide :
The new application is LCD_MANAGE_POLL_TURN_ON with value rs232.tx_hex=64612030302030310D.
But i got no result, is there any correction for my step ? or any hint for my issue ? and how to check that my DMP have activated RS-232 supported without send command to my LCD (what i mean is there are any sign or mark in DMP ?).
From what you say, the procedure was carried out correctly, so, you should be able to use RS232 commands to manage your screen. Have you tested if RS232 is working? If so, how are you testing it?
Another thing you can try is using a browser to access the URL https://
With this command, you will get the RS232 configuration on your DMP, as well as the last command sent to the screen (
rs232.tx_hex) and the last reply received (rs232.rx_buf)
I hope this helps
Thanks for the troubleshooting guide.
Im working with rizal for this issue. We have tested the RS232 by connecting the DMP to our laptop, and use hyperterminal to receive the hex sent from DMP. Hyperterminal shows unreadable digit when we push the system task for LCD turn off.
We use Cisco console cable and connect the other end with RJ to DB9 converter.
Below is the result from https about the last command sent from DMP.
rs232.device T_STRING /dev/ttyS0 rs232.speed T_STRING 9600 rs232.parity T_STRING none rs232.data_size T_STRING 8 rs232.stop_bits T_STRING 1 rs232.flow_ctrl T_STRING none rs232.tx_hex T_STRING aa11fe010010 rs232.tx_str T_STRING rs232.rx_buf T_STRING rs232.rx_overflow_flag T_STRING false rs232.tx_cnt T_STRING 15 rs232.rx_cnt T_STRING 0
We are wondering why the default system task to activate RS232 control support sent via /dev/ttyS1. The DMP is sending the command via ttyS0 as the result above. Here is the system task:
We tried to change the system task to /dev/ttyS0 but still no luck.
We have tried both of the port of the LCD, in and out, but still cant turn off the display..
Any idea about this?
I think we have reached the limit of what we can troubleshoot on a public forum. Moving forward, I think it would be a good idea to open a TAC service request and continue with the investigation there.
Following on the case, I am updating this thread for future reference.
For 42" and 47" monitors the command set is different to what was used above.
We used the process below to power off the monitor:
Digital Signs > Digital Media Players > Advanced Tasks. > System Tasks
Use the Name field to enter a unique name for your new application, such as LCD_MANAGE_POLL_TURN_ON.
b. Choose Set from the Request Type list.
c. Enter the necessary command in hexadecimal.
Use the Request field to enter exactly this hexadecimal string:
Deploy the System Task event called "RS-232: Control supported, non-DMTech displays"
Create new tasks
check out 42" and 47" NPI slides
Lock on: rs232.tx_hex=AA36FF010036
Lock off: rs232.tx_hex=AA36FF010037
Good source for these commands on the original Cisco LCD displays is here: