Specifications

Maestro
tm
Phone [phone] • Fax [phone]
®
Appendicies
Section 8-5
Appendix C –
RS-232 Serial Control Protocol Commands
You must set the external RS-232 control system serial port to match
the data speed and format that the Maestro is expecting. If these
settings are not correct, the Maestro will not respond to the com-
mands.
Set your communication parameters as follows:
Baud Rate: 38,400
Data Bits: 8
Parity: None
Stops Bits: 1
Flow Control: None
The cable wiring to connect the Maestro to your control system will
depend on the RS-232 output connection on the controller. Make
certain that you wire the Transmit Data output on the serial controller
to the Receive Data on the Maestro and vice versa on the Receive Data
line on the controller system. Connect the signal grounds on the
control system and the Maestro together. The RS-232 connection on
the rear panel of the Maestro is a DB-9 Male wired as follows:
Pin 2 Receive Data (RXD)
Pin 3 Transmit Data (TXD)
Pin 5 Ground
To connect the Maestro to a standard PC serial comm port; wire the
cable in a ‘null modem’ arrangement.