Watson-Marlow PF22 - Manual (Page 33)

Operators Manual
PF22
PF22 OM EN 74-132-005 v1.02.doc Version: 1.02 Page 33 of 34
9.2 RS-232
RS-232 has a 9-pin SUB-D plug.
PIN 1: No connection
PIN 2: Receive data
PIN 3: Transmit data
PIN 4: +12 VDC (at 1 kOhm)
PIN 5: Ground
PIN 6: No connection
PIN 7: Request to send
PIN 8: Clear to send
PIN 9: No connection
9.3 Change of main power
Fig. 9.2
PF22 can be changed over to different main powers.
The change over is carried out inside the machine by moving the wires to the positions indicated in
Fig. 9.2.