PCM-2 Manual.pdf - Voss Associates

I/O Connector
Assignments
The following is a detailed list of the front panel I/O pins. Input and output
addresses are specified in hexadecimal. "+V" refers to the nominal 12-Volt
supply. Connector pin numbers read clockwise around the board.
COilllector
Pinout:
Connector
Pinout:
Connector
Pinout:
Connector
Pinout:
PI: Power input and main serial data bus
01 RS-485 + (CPU internal UART)
02 RS-485 - (CPU internal UART)
03 Ground
04 +V
05 +V
06 Ground
07 Ground
P2: Serial data to/from optional badge reader
01 Reader type sense: L = ICI barcode
02 RxD (from reader)
03 TxD (to reader)
04 DTR (to reader)
05 Ground
06 DSR (from reader)
07 +5 volts (to reader)
08 +V
09 Reader type sense: L = Xico magstripe
Note: This UART's address is C008
Note: Pins 1 and 9 pulled low for Computer Identics reader.
P3: Host computer port
01 RS-485 +
02 RxD (from host)
03 TxD (to host)
04 DTR (to host, RS-232 only)
05 Ground
06 DSR (from host, RS-232 only)
07 N/C
08 N/C
09 RS-485­
Note: This UART's address is COlO
Note: Port may be configured for either RS-232 or RS-485
P4: Not currently used
01 N/C
02 RxD (from external device)
03 TxD (to external device)
04 DTR (to external device)
05 Ground
11 -4 PCM2.MAN/ Rev A/April 1995