5-4
5.2.2  RTU-to-Modem Synchronous Connection (DTE-to-DCE) 
Use the FLN6704A cable kit to connect one of the IRRInet-XL RTU RS-232 ports to a 
modem synchronously (the RTU serves as a DTE). The kit includes a cable with RJ45 
modular jacks on both ends and a RJ45 to 25-pin female D-Type adaptor (See Figure  
5-3). The possible RTU configurations are detailed in Table  5-2 below: 
Table  5-2 RTU-to-Modem Synchronous Connection (DTE-to-DCE) 
CPU Port No.  Used with Piggyback Board Toolbox Definition 
3  FRN5724A 
RS-232 Asynchronous External 
Modem, Full Duplex or Multi-Drop Half 
Duplex, Darcom Modem, Darcom 
Master/Repeater 
 
 
J1 
(RJ45) 
J2 
(25-PIN 
D-TYPE)
 
Tx_DATA 
Rx_DATA 
RTS 
CTS 
GND 
TxCLK 
Rec_LINE 
RxCLK 
1 
2 
6 
3 
4 
8 
5 
7 
2
3
4
5
7
15
 
8
Tx_DATA
 
Rx_DATA 
RTS 
CTS 
GND
TxCLK
 
Rec_LINE 
TxCLK
17
 
RJ45 
Connector
Pin No. 1 
Pin No. 8 
 
Figure  5-3 RJ45-to-D-Type Male Connector Adaptor