Usrobotics V.34 Manual de usuario descargar pdf (Pagina 97)

COURIER HIGH SPEED MODEMS

Summaries and Tables B-3

PIN ASSIGNMENTS

The entire standard covers many more functions than are used

in most data communications applications. Pin assignments are

factory set in the Courier to match the standard DB-25 assign-

ments in the following table. DB-9 connectors for AT-

compatible computers should be wired at the computer end of

the cable as shown in the DB-9 column. If you're using an

Apple computer, we strongly recommend that you purchase a

Hardware Handshaking cable to get the highest possible reliability

performance.

Signal Flow

DB-25 DB-9 Circuit Function Computer

Modem

1 _ AA Chassis Ground both directions

2 3 BA Transmitted Data to modem

3 2 BB Received Data to computer

4 7 CA Request to Send to modem

5 8 CB Clear to Send to computer

6 6 CC Data Set Ready to computer

7 5 AB Signal Ground both directions

8 1 CF Carrier Detect to computer

12 _ SCF Speed Indicate to computer

15 _ DB Synchronous TX

Timing to computer

17 _ DD Synchronous RX

Timing to computer

20 4 CD Data Terminal Ready to modem

22 9 CE Ring Indicate to computer

24 _ DA Synchronous TX

Timing to modem

* Indicates Transmitter (TX) or Receiver (RX)

Table B.1RS-232 Interface Pin Definitions

1 2 ... 92 93 94 95 96 97 98 99 100 101 102 ... 244 245

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Usrobotics V.34 Manual de usuario Pagina 97