Watson-Marlow 323Du User Manual
Page 27
Watson-Marlow 323E, 323S, 323U and 323Du User Manual
27
RS232 settings
Baud
9600
Stop bits
2
Data bits
8
Parity
None
Flow control
None
Echo
On
Pump inteface
pin
Function
1
-
2
RX (Receive data)
3
TX (Transmit
data)
4
-
5
GND (Ground)
6
-
7
-
8
Reserved
9
-
RS232 command modes
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).
Com-
mand
Function
Com-
mand
Function
1SPxxx
Set pump speed to xxx
1RC
Reverse direction
1SI
Increase speed by 1rpm
1RR
Set clockwise direction
1SD
Reduce speed by 1rpm
1RL
Set counter-clockwise
direction
1GO
Start pump
1RS
Show all pump information
1ST
Stop pump
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.