Baoding Shenchen F Series Manual page 16

Shenchen Pump
If it is an external relay, when the motor is running, K1 is closed, and when it
stops, K1 is disconnected.
5) RS232 communication port: Select RS232 in the communication setting
interface, this port is valid.
GND: Communication ground terminal.
TXD: Master sending, peristaltic pump receive signal terminal.
RXD: Peristaltic pump sending, master receive signal terminal.
RS232 connection wiring diagramme as below:
6) RS485 communication port: Select RS485 in the communication setting
interface, this port is valid.
GD1:RS485 ground wire.
A+:connect with RS485 A+.
B-: connect with RS485 B-.
Note:A. Choose RS232 or RS485, the communication protocol is both
standard MODBUS protocol.
B. Only when the pump in main interface, RS232 and RS485
communication is workable.
RXD
TXD
GND
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F Series