Hi Tomas and Jeff,
I have tried executing the suggested commands and still no luck.
When I executed the enquiry command:
Sony (POWER Enquiry)
I received the following dialogue in a new browser session but no actual response:
http://<user id>:<password>@<DMP IP address>:7777/get_param?rs232.tx_hex=830000ffff81
When I ran the screen Off command (TV was on):
Sony (Turn OFF)
Screen didn turn off.
I opened a browser session and added the following: http://<DMP IP Address>:7777/get_param?p=*.*:
and could see the command in the output:
rs232.tx_hex T_STRING 8c000002008e
I also checked to ensure the rs232 service was enabled:
init.startService_rs232 T_STRING yes
So it appears that the commands are being passed to the DMP.
Im going to try another test where I connect the rs-232 cable from my laptop to the DMP and Ill send the command using hyperterminal to see if the DMP will respond. Ill let you know the outcome in a few hours as I have to go to another building to perform the test.