LSIS XBL-C41A

Chapter 12 Installation and Wiring
12 −19
(1) How to connect RS-232C connector during modem connection (XBL-C21A)
This module can communicate with devices of long distance as connected with modem. Modem and
RS-232C channel shall be connected as in [Figure 12.5.2] below.
Cnet (9-PIN)
Connection No. and signal direction
Modem side (25-PIN)
Pin No.
Name
Name
Pin No.
1
CD
CD
8
2
RXD
RXD
3
3
TXD
TXD
2
4
DTR
DTR
20
5
SG
SG
7
6
DSR
DSR
6
7
RTS
RTS
4
8
CTS
CTS
5
9
RI
[Note]
RI
22
[Figure 12.5.2] Cable Connection between RS-232C and Modem
[Note] No.9, RI signal is not used in XBL-C21A I/F module.
(2) How to connect connector for RS-232C in null modem mode
In null modem mode, the connector can be connected in 3-line type as below.
Cnet (9-PIN)
Connection No. and signal direction
Computer/communication
devices
Pin No.
Name
Name
1
CD
CD
2
RXD
RXD
3
TXD
TXD
4
DTR
DTR
5
SG
SG
6
DSR
DSR
7
RTS
RTS
8
CTS
CTS
9
RI
RI
[Figure 12.5.3] 3-line Type of Connection (no handshake)