Rtu-To-Modem Connections - Motorola MOSCAD-M RTU Hardware Manual

When the connector is facing upwards, the left-hand pin
is Pin No. 1, and the right-hand pin is Pin No. 8.
Rec Line (DCD)

RTU-to-Modem Connections

Only R&TTE approved modems should be
used to connect the RTU to the PSTN.
RTU-to-Modem Asynchronous Connection
For a 9-pin or 25-pin connection, use the FLN6458 cable kit to connect one of the
MOSCAD-M RTU RS-232 ports asynchronously to a modem. (The RTU serves as
DTE.) The kit includes a cable with RJ45 modular jacks on both ends and an RJ45 to 9-
pin and 25-pin male D-Type adapter (see Figure 2). The possible RTU configurations are
detailed below:
Port No. Configurator Definition
1 RS-232 UART External Dialup Modem (MDLC)
1. Before transmitting, the RTU sends an RTS=on
RJ45
Connector
J1
(RJ45)
2
Tx DATA
1
Rx DATA
5
RTS
8
CTS
7
DSR
4
GND
3
DTR
6
Figure 1
RJ45-to-D-Type Female Connector Adapter
signal to the modem, and will not transmit unless it
receives a feedback CTS=on signal from the
modem.
CABLES AND ADAPTERS
J2
(9-Pin (25-Pin
D-Type) D-Type)
(3) 2
Tx DATA
(2) 3
Rx DATA
(7) 4
RTS
(8) 5
CTS
(6) 6
DSR
(5) 7
GND
(4) 20
DTR
(1) 7
Rec Line (DCD)
8