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12 Chapter 4 EIA-232: DB-25 to DB-25
DB-25 4-Wire hardware handshaking (DTR) cable
The following four-wire cable is often sufficient for an older terminal, printer,
or other DTE device configured for DTR (hardware) flow control. However,
some terminals and printers may use a signal other than DTR for flow
control. In addition, some terminals and printers may have other cable
requirements. Consult your terminal or printer manual for this information.
For more universal compatibility, use a full-wired DB-25 terminal/printer
cable.
Terminal/printer cable with DTR handshaking
Note: Some terminal or printer manufacturers may use different methods of flow
control. Consult your documentation for specific wiring requirements.
DB-25 female
(Digi end)
DB-25 male
(peripheral)
Signal Pin Pin Signal
TxD 2 connected to 3 RxD
RxD 3 connected to 2 TxD
CTS 5 connected to 20 DTR
SG 7 connected to 7 SG
GND Shell connected (via shield) to Shell GND
jumpered 4+5 RTS+CTS
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