RTS XCP-48-RJ45 Specifications Page 100

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DB-9F to DB-25M Modem Cable
Modem Cables
EIA-232 Modem Cables DB-9 to DB-25
The wiring diagram for a DB-9 to DB-25 modem cable is shown in Table 1.
Table 1: EIA-232 DB-9 to DB-25 modem cable
DB-9 Signal Direction Signal To DB-25
1 DCD DCD 8
2 RxD
RxD 3
3 TxD
TxD 2
4 DTR
DTR 20
5SG
SG 7
6 DSR
DSR 6
7 RTS
RTS 4
8 CTS
CTS 5
9RI
RI 22
Shell GND
GND Shell
* Arrows indicate which direction the signal is flowing
NOTES:
Altpin should be turned off when using this cable.
This cable utilizes the CTS signal of the modem for hardware flow control (RTS/CTS).
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