RS232 Communications
CAUTION: Always turn electrical power to the Circulator OFF before making a connection to the
serial (DB9) port.
Serial Connector — A DB9 connector is provided on the back panel of the Controller for RS232 data
communication.
Pin RS232
1
2 TX
3 RX
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9
Serial Communications Protocol — The Controller uses the following serial communications settings:
Data bits — 8
Parity — None
Stop bits — 1
Flow control — None
Baud rate — Selectable (Controller/PC baud rates must match). 57600 is recommended.
Communications Commands — RS232 commands must be entered using the command only. All
commands must be entered in the exact format shown. Do not send a [LF] (line feed) after the [CR]
(carriage return). Be sure to follow character case exactly.
A response followed by an exclamation point (!) indicates that a command was executed correctly. A
question mark (?) indicates that the Controller could not execute the command (either because it was in
an improper format or the values were outside the allowable range). A response must be received from
the Controller before another command can be sent. All responses are terminated with a single [CR].
110-512 PSC/EN
44
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