### DB-25 Hardware Handshaking (Ready/Busy)

Terminal/Printer Cable with DTR Handshaking

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 | 1 (or shell) | connected (via shield) to | 1 (or shell) | GND
| jumpered | 4 & 5 | RTS & CTS

This cable is valid with any Digi DB-25 serial port including Concentrator ports, PORTS/Xem Modules, ClassicBoards, and Xe, Xr, PC/X adapters.

Most terminals and printers use Data Terminal Ready (DTR) for Ready/Busy hardware handshaking. The cable shown supports this method.

Some Okidata printers use a control signal on pin 11, called Supervisory Send Data (SSD) instead of DTR. In this case, simply connect CTS on the female DB-25 side to pin 11 of the male DB-25, instead of pin 20.

Other printer manufacturers may use different methods of flow control. Consult your printer's documentation for specific wiring requirements.

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