BCDx36HP List of Key Codes for Remote Control?

Is there any documentation listing the KEY_CODEs available to send to the BCDx36HP models over the serial connection?



I found one source indicating the following command pattern:

Controller → Radio KEY,[KEY_CODE],[KEY_MODE][\r]



However, it didn't appear to show the keys for the BCDx36HP models.



As one example, I would like to be able to send the command simulating someone pressing the Channel key to hold on a channel, but I don't know what the KEY_CODE is for that or System and Dept keys.



Thanks for any help.