
RJ-45 to DB-25M Terminal Printer Cable
Terminal/Printer Cables
EIA-232 Terminal/Printer Cables, Altpin RJ-45 8-pin to DB-
25
The wiring diagram for an altpin RJ-45 8-pin to DB-25 terminal/printer cable is shown in Table 1.
Table 1: EIA-232 Altpin RJ-45 8-pin to DB-25 terminal/printer cable
From
RJ-45
Signal Direction Signal To DB-25
1 DSR RTS 4
5 RxD
TxD 2
4 TxD
RxD 3
8 DTR
DSR 6
DCD 8
6SG
SG 7
2 RTS
CTS 5
7 CTS
DTR 20
3 GND
GND Shell
* Arrows indicate which direction the signal is flowing
NOTES:
●
Altpin should be turned on when using this cable so that DTR will drive DCD (standard usage).
●
If altpin is turned off, the hardware signal on RJ45 pin 1 becomes DSR instead of DCD. This
alternative can be used if DCD is not required, and DSR is needed instead.
●
This cable utilizes the DTR signal of the terminal/printer for hardware flow control (RTS/CTS).
●
Okidata printers may use SSD (pin 11) instead of DTR (pin 20) on DB25 side of above diagram. If
this is the case, the printer should be set to SSD+.
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