Command Structure; Command Sequence - Encoded Media IPTV Receiver 250 Installer's Manual

COMMAND STRUCTURE

Each command is followed by a single space; each parameter provided thereafter
should be separated by a , comma (0x2c).
Both commands and parameters are of variable rather than fixed length. All
commands must be terminated by a  carriage return (0x0d).
Command
S T B
53 54 42 4d 55 54 45 20 74 72 75 65 0d
Some examples:
The Receiver is asked to play channel 4:
STBPLAYCH 4
The Receiver is asked to set the volume level at 50%:
STBVOLUME 50

COMMAND SEQUENCE

Commands are executed in the order they are received. The host must wait for a
response from the Receiver before sending the next command.
Should the Receiver be sent a new command before completing execution of the
previous command, it may discard the previous command.
Should the host not receive a response from the Receiver within 2 seconds of the
command being issued, the host may consider the command or the response lost
during transmission, and should retransmit it.
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M U T
Parameters
E t
e 
r u
CR