Gasboy CFN Series Diagnostic Manual - Manual (Page 352)

Site Controller III
12-18 1116
P2 - CPU PCB Communication ports Interface
Pins A1 - A16
Pinout Pin Function Input/Output
A1 RXD – Receive data, port 6 Input
A2 TXD – Transmit data, port 6 Output
A3 DSR – Data set ready, port 6 Input
A4 DTR – Data terminal ready, port 6 Output
A5 CTS – Clear to send, port 6 Input
A6 RTS – Ready to send, port 6 Output
A7 DCD – Carrier detect, port 6 Input
A8 DC Ground DC Ground
A9 DCD – Carrier detect, port 5 Input
A10 RTS – Ready to send, port 5 Output
A11 CTS – Clear to send, port 5 Input
A12 DTR – Data terminal ready, port 5 Output
A13 DSR – Data set ready, port 5 Input
A14 TXD – Transmit data, port 5 Output
A15 RXD – Receive data, port 5 Input
A16 -12VDC -12VDC
P2 - CPU PCB Communication ports Interface (Continued)
Pins B1 - B16
Pinout Pin Function Voltage
B1 RXD – Receive data, port 4  receive; +5VDC OFF
B2 DSR – Data set ready, port 4  0VDC – ON
B3 TXD – Transmit data, port 4  transmit; +5VDC OFF
B4 CTS – Clear to send, port 4  0VDC – ON
B5 DCD – Carrier detect, port 4  0VDC – ON
B6 RTS – Ready to send, port 4  0VDC – ON
B7 DTR – Data terminal ready, port 4  0VDC – ON
B8 DC Ground DC Ground
B9 DTR – Data terminal ready, port 3 Not used +5VDC
B10 RTS – Ready to send, port 3
0VDC Tokheim Channel 1;
+5VDC Tokheim Channel 2
B11 TXD – Transmit data, port 3  transmit; +5VDC OFF
B12 DSR – Data set ready, port 3 Not used 0VDC
B13 RXD – Receive data, port 3  receive; +5VDC OFF
B14 DCD – Carrier detect, port 3 Not used 0VDC
B15 CTS – Clear to send, port 3 Not used 0VDC
B16 +12VDC +12VDC