Back-to-back connections to a second modem, Rs-232 (rtu) interface – Telenetics DSP9612RM User Manual
Page 33
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Back-to-Back Connections to a Second Modem
Page
33
Back-to-Back Connections to a Second
Modem
Rx
Rx
Rx
Rx
Tx
Tx
Tx
Tx
Modem 1
Modem 2
RS-232 (RTU) Interface
Signal
Name
Modem
Input/Output
DB25
Pin
Description
Earth GND
1
Earth Ground
TXD
Input
2
Transmit Data
RXD
Output
3
Receive Data
RTS
Input
4
Request To Send
CTS
Output
5
Clear To Send
DSR
Output
6
Data Set Ready
(Modem Ready)
SG
-
7
Signal Ground
DCD
Output
8
Data Carrier Detected
DTR
Input
20
Data Terminal Ready
(Host Ready)
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