21
ASYNC RS-232 TO 2-WIRE RS-485 CONVERTER
Table A-1. Direction of the RS-232 Signals.
Pin Number
Signal Name
Direction
1
Frame Ground (FG)
2
Transmit Data (TD)
To Converter
3
Receive Data (RD)
From Converter
4
Request to Send (RTS)
To Converter
5
Clear to Send (CTS)
From Converter
6
Data Set Ready (DSR)
From Converter
7
Signal Ground (SG)
8
Data Carrier Detect (DCD)
From Converter
9
External Power
To Converter
Table A-2. DCE Connection Wiring Diagram.
Converter (25-pin)
DCE Device (25-pin)
1 - - - - - - - - - - - - - - - - - - - - - - - - 1
2 - - - - - - - - - - - - - - - - - - - - - - - - 3
3 - - - - - - - - - - - - - - - - - - - - - - - - 2
4 - - - - - - - - - - - - - - - - - - - - - - - - 5
5 - - - - - - - - - - - - - - - - - - - - - - - - 4
6
8 - - - - - - - - - - - - - - - - - - - - - - - - 20
7 - - - - - - - - - - - - - - - - - - - - - - - - 7
20 - - - - - - - - - - - - - - - - - - - - - - - 6
8
