937B Controller Instruction Manual
pg. 70
9
RS232/485 Serial Communication Commands
9.1 Serial Communication Wiring Diagram
Table 9-1 937B Serial Communication Wiring Diagram
9.2 Communication Protocols
Cable length with RS232 signals
50 ft (15 m)
Cable length with RS485 signals
4000 ft (1200 m)
Baud rate
9600, 19200, 38400, 57600, 115200
Character format
8 data bits, 1 stop bit, No parity, No hardware handshaking
Query format
@<aaa><Command>?;FF
The corresponding response is
@<aaa>ACK<Response>;FF
Here,
<aaa>
: Address, 1 to 254
<Command>
: Commands as described in 9.3 to 9.14
<Response>
Responses as described in 9.3 to 9.14
For example, to query pressure on channel A1, use
@003PR1?;FF
and the corresponding response is
@003ACK7.602E+2;FF
Here
, <aaa>=003; <Command>=PR1; <Response>=7.602E+2
Set format
@<aaa><Command>!<parameter>;FF
The corresponding response is
@<aaa>ACK<Response>;FF
Here,
<aaa>
: address, 1 to 254
<Command>
Commands as described in 9.3 to 9.13
<Parameter>
Parameter as described in 9.3 to 9.13
<Response>
Responses as described in 9.3 to 9.13
For example, to set new baud rate, use
@001BR!19200;FF
and the corresponding response is
@001ACK19200;FF
Here
, <aaa>=001; <Command>=BR; <Parameter>=19200;
<Response>=19200
Table 9-2 937B Serial Communication Command Protocol
Pin
Description
2
RS485(-)/RS232TxD/(B)
3
RS485(+)/RS232RxD/(A)
5
Ground