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The Baud-rate is the transmission speed.
Here's a list of the Mazatrol controls baud rate parameter:
T1 - Parameter A7 (Default at 16 which is 4800 baud)
T32/T+ - Parameter I1 (Default at 2 which is 4800 baud)
M32/M+ - Parameter G1 (Default at 2 which is 4800 baud)
640M - There's a dialog