Hall Research HR-733-S - Manual (Page 18)

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Model HR-733
mode, you can specify the remote unit’s serial parameters (baud-rate and
parity). However, please note that the Sender’s baud rate is fixed at 9600.
In this way the PC or other serial device (such as touch-screen control
system) uses 9600 baud rate to communicate with HR-733-S. The system
takes care of baud-rate changes that are needed at the remote end, and
using FIFO buffers ensures no data is lost.
The RS-232 port on the sender can also control the sender in command
mode. This is done by appending a special set of characters to the serial
data that is sent to the HR-733-S.
6.5 Using the HR-733-S in Command Mode
If the data received at the serial port contains ==> (equal, equal, greater
than), then the Sender will interpret it as start of a command sequence. In
this mode you can specify one of the commands described in the following
section. The unit will stay in command mode until it gets a Carriage
Return . Once a command is executed, the unit will go back to Serial
pass-through mode (if data channel is configured that way). The ==>
and command sequence are not transmitted to the HR-733-R remote unit.
Most commands (such as input channel selection), can be issued to the
HR-733-S regardless of how its data channel is configured (CEC or RS-
232 pass through). There are a few commands that cannot be executed in
CEC mode as noted below.