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BWS-136 User Manual_amend.doc - 11 -
Serial Port Pin Assignments
Serial Port COM1 uses a Male DB9 connector and it includes
RS-232, RS-422 and RS485 signal and pin assignments are
described as follow:
Transmission Signals
Pin
Number
RS-232 4-wire
RS485
RS-485
1 DCD TxD- -
2 RxD TxD+ -
3 TxD RxD+ Data+
4 DTR RxD- Data-
5 GND GND GND
6 DSR - -
7 RTS - -
8 CTS - -
9 - - -
BWS-136 User Manual_amend.doc - 12 -
Digital I/O
Digital I/O uses DB9 connector and the pin assignments
are described as follow:
Pin 1: DIO4
Pin 2: DIO3
Pin 3: DIO2
Pin 4: DIO1
Pin 5: DIO0
Pin 6: GND
Pin 7: DIO7
Pin 8: DIO6
Pin 9: DIO5
DIO0 to DIO5 are TTL compatible Programmable
DIO and DIO 6 to DIO7 are CMOS compatible Programmable DIO.
All the DIO channel are pull up +5VDC with a 4.7K Ohm resistor.
As an Output
DIO
GND
As an Input
DIO
GND