11
RS232 settings
Pump interface pin
Function
Baud
9600
1
-
Stop bits
2
2
RX (Receive data)
Data bits
8
3
TX (Transmit data)
Parity
None
4
-
Flow Control
None
5
GND (Ground)
Echo
On
6
-
7
-
8
DTR
9
-
RS232 command codes
These are the codes to control the pump with the RS232 serial link. They must be sent to the pump from a
computer serial port (or equivalent).
Command
Function
1SPxxx
Set pump speed to xxx
1SI
Increase speed by 1rpm
1SD
Reduce speed by 1rpm
1GO
Start pump
1ST
Stop pump
1RC
Reverse direction
1RR
Set clockwise direction
1RL
Set anti-clockwise direction
1RS
Show all pump information
1ZY
Show running status of the pump. STARTed 1 or STOPped 0
Always terminate each command with a RETURN (ASCII CHR13).
Notes on control codes
There should be at least 10mS between commands.
The command RS to show all pump information will return the following text string:
[pump type] [speed] [CW / CCW rotation] [stopped/running, 0 /1] [! delimiter]
e.g. 323Du 110 CW 1 !
Note: both 9 and 25-way D shells are earthed.
