Cabling – Bay Technical Associates DS74 User Manual
Page 4
DS74 Serial I/O Module
4
Cabling
RJ-45 Cables and Adapters
DS74 EIA-232 RJ-45 Signal
Pin EIA
232
Signal
Signal
Direction
Description
1 DTR Out
Handshake, Line Driver Inactive State = Low: -12V when port is selected
unless programmed differently. Used as a handshake line to enable/disable
the receiving of characters.
2 GND
Signal
Ground
3 RTS Out
Handshake, Line Driver Inactive State = Low: -12 V when port is selected
unless programmed differently.
4
TX
Out
Transmit Data Out
5 RX
In
Receive
Data
In
6 DSR In
Handshake In. +12V when not used.
7 GND
Signal Ground
8 CTS In
Used as a handshake line to enable/disable the receiving of characters.
Adapters Signals
Listed are the pin
specifications for the BayTech cable and adapters and the terminal COM ports:
Signal RS-232
Port (DS)
RS-232
Port (RPC)
COM Port
DE-9 Pin
COM Port
DB-25 Pin
Signal
DTR 1
1
4
20 DSR
GND 2
2
1 GND
RTS 3
3
7
5
CTS
TXD 4
4
3
2 RXD
RXD 5
5
2
3
TXD
DSR 6
N/C
6
6 DTR
GND 7
7
5
7
GND
CTS 8
8
4
RTS
DTR
4
DCD
DCD
8
1
8 DTR
RI 9
22