Watson-Marlow 505Du - Manual (Page 15)

15
The drive will now be under the exclusive control of the RS232 signal. The front
panel Stop key acts as an emergency stop, and will disable RS232 auto-control
signals if pressed. Shown left are the connections for RS232 signals (viewed
from inside the plug).
Connections for RS232 signals (viewed from inside the plug).
RS232 cabling shown for CTR handshake
Use only twin shielded RS232 cables.
Baud Set in SETUP, BAUD (factory default is 9600)
Stop bits 2
Data bits 8
Parity None
Handshake CTR or None
Auto echo On
Pin Function Pin Function
1 - 6 -
2 RX (Receive data) 7
3 TX (Transmit data) 8 DTR (Data terminal ready)
4 - 9 -
5 GND (Ground)
The following codes may be used to operate the 505Du under RS232 control.
They must be directed to the pump from a computer serial port (or equivalent).
Always terminate each command with a RETURN (ASCII CHR13).
nSPxxx Load speed setting xxx to pump number n
nSI Increment speed by 1rpm for pump n
nSD Decrement speed by 1rpm for pump n
nGO Start pump number n
nST Stop pump number n
5 1
9 6
RS232 settings