9600 BPS Faxmodem  (250-3030)       Pinouts            Faxback Doc. # 5237

CONNECTOR PIN ASSIGNMENTS

RS-232 CONNECTOR

The faxmodem provides a DTE interface via a 25-pin female (DB-25S) connector 
that adheres to the EIA RS-232-C standard. This connector is located on the 
back of the faxmodem.

RS-232-C PIN ASSIGNMENTS

The following table summarizes the RS-232-C pin assignments that pertain to 
your faxmodem. You cable must provide these signals for your DTE to 
communicate with your faxmodem.

┌────────┬────────┬──────────────────────────────┬─────────────────────────┐
│PIN NO. │ NAME   │ FUNCTION                     │ SIGNAL DIRECTION        │
├────────┼────────┼──────────────────────────────┼─────────────────────────┤
│  1     │        │ Protective Ground            │                         │
│  2     │ RXD    │ Received Data                │ To faxmodem             │
│  3     │ TXD    │ Transmitted Data             │ From faxmodem           │
│  4     │ RTS    │ Request to Send              │ To faxmodem             │
│  5     │ CTS    │ Clear to Send                │ From faxmodem           │
│  6     │ DSR    │ Data Set Ready               │ From faxmodem           │
│  7     │        │ Signal Ground                │ Common                  │
│  8     │ RLSD   │ Received Line Signal Detector│ From faxmodem           │
│ 12     │ CI     │ Modem Speed Indicator        │ From faxmodem           │
│ 15*    │ TDCLK  │ Transmit Data Clock          │ From faxmodem           │
│ 17*    │ RDCLK  │ Receive Data Clock           │ From faxmodem           │
│ 18     │ AL     │ Analog Loop                  │ To faxmodem             │
│ 20     │ DTR    │ Data Terminal Ready          │ To faxmodem             │
│ 21     │ RDL    │ Remote Digital Loop Select   │ To faxmodem             │
│ 22     │ RI     │ Ring Indicator               │ From faxmodem           │
│ 24*    │ XTCLK  │ External Transmit Clock      │ To faxmodem             │
│ 25     │ TM     │ Test Mode Indicate           │ From faxmodem           │
└────────┴────────┴──────────────────────────────┴─────────────────────────┘
* These signals are used during synchronous operation only.

(dtc-07/30/93)