Rtu To Modem Connection; Rtu-To-Modem Asynchronous Connection; Figure 5-2 Rj45-To-D-Type Male Connector Adaptor; Table 5-1 Rtu To Modem Asynchronous Connection - Motorola IRRInet-XL Owner's Manual

5.2 RTU to Modem Connection

5.2.1

RTU-to-Modem Asynchronous Connection

For a 9-pin or 25-pin connections, use the FLN6458 cable kit to connect one of the
IRRInet-XL 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 a RJ45 to 9-pin and
25-pin male D-Type adaptor (See Figure 5-2).
The possible RTU configurations are detailed in Table 5-1:

Table 5-1 RTU to Modem Asynchronous Connection

CPU Port No. Used with Piggyback
Board
2
3
N o t e :
N o t e :
1. Before transmitting, the RTU sends a RTS = on signal to the modem, and will
not transmit unless it receives a feedback CTS=on signal from the modem.
2. The RTU will not receive unless it receives a DCD = on signal from the
modem.
3. When using a modem in auto-answer mode (connected to a computer port)
for remote service, the RTU does not support the RTS/CTS protocol, as the port
is designed to operate with a local computer as well as with a modem. Refer to
the jumper settings detailed in the Utilities section of the Programming Tool Box
Operating Instructions manual.
Pin No. 1
RJ45
J1
Connector
(RJ45)
1
Tx_DATA
2
Rx_DATA
6
RTS
3
CTS
4
GND
8
DTR
5
Rec_LINE (DCD)
7
+12V

Figure 5-2 RJ45-to-D-Type Male Connector Adaptor

Toolbox Definition
- RS-232 UART External Modem (MDLC)
RS-232 Asynchronous External Modem,
FRN5724
Full Duplex or Multi-Drop Half Duplex
Pin No. 8
(9-PIN
D-TYPE)
NOT USED
J2
(25-PIN
D-TYPE)
(3)2
Tx_DATA
(2)3
Rx_DATA
(7)4
RTS
(8)5
CTS
(5)7
GND
(4)20
DTR
(1)8
Rec_LINE (DCD)
5-3