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A-1
APPENDIX A
A.1 Rear Panel Serial Communications Port - Pump
An RS-232C modular jack is provided on the back panel. A
computer, with appropriate software, can be used as a remote
controlling device for pump operation via this connection.
A.1.1 Hardware Implementation
The REMOTE INPUT serial communications port is configured
for 9600 baud, 8 data bits, 1 stop bit, and no parity. The connector is a
standard RJ-11 modular telephone type jack. When looking at the
connector on the rear panel of the pump, pin 1 is at the top and pin 6 is
at the bottom. The pin-out is:
Pin Function
1, 6 Ground
2 DSR (Handshaking input to pump)
3 RXD (Serial data input to pump)
4 TXD (Serial data output from pump)
5 DTR (Handshaking output from pump)
Special wiring considerations: Use the following chart for
interfacing the pump's serial communications port to either a 25-pin or
a 9-pin COM port on an IBM-PC type computer.
Pump (RJ11) Signal IBM (DB25)
a
IBM (DB9)
b
1, 6 Ground 7 5
2 DSR 20 4
3 RXD 2 3
4 TXD 3 2
5 DTR 6 6
a
Jumper pins 4, 5, and 8 on DB25.
b
Jumper pins 1, 7, and 8 on DB9.
Part Description Part Number
Modular Cable 12-0677
Adapter RJ-11 to DB9 12-0672
Adapter RJ-11 to DB-25 12-0671
A.1.2 Hand-Shaking
The pump uses hardware handshaking. The pump will not
transmit on the TXD output if the DSR input is at a low logic level.
And, the pump will not receive on the RXD input when the DTR