DMP 2102  (260-2817)              Pinouts              Faxback Doc. # 4446


PIN NUMBER    SIGNAL        SIGNAL DIRECTION         FUNCTION

   1       DATA STROBE -N  TO PRINTER       Samples the input data when
                                            changing from low to high.
   2       DATA BIT 1 ─┐
                       │
   3       DATA BIT 2  │
                       │
   4       DATA BIT 3  │
                       │
   5       DATA BIT 4  ├─  TO PRINTER       Indicates the input data. High
                       │                    level signal shows a 1, and low
   6       DATA BIT 5  │                    level signal shows a 0.
                       │
   7       DATA BIT 6  │
                       │
   8       DATA BIT 7  │
                       │
   9       DATA BIT 8 ─┘

  10       ACKNOWLEDGE -N  FROM PRINTER     At a low level, indicates that
                                            a character input is complete
  11       BUSY            FROM PRINTER     or that a function operation is
                                            finished. At a high level, data
                                            reception is impossible. At a
                                            low level, data reception is
                                            possible.
  12       PAPER END       FROM PRINTER     At a high level, indicates
                                            paper end.

  13       BUSY -N         FROM PRINTER     Tandy mode: At a low level,
           SELECT          FROM PRINTER     data reception is impossible.
                                            At a high level, data reception
                                            is possible.
                                            IBM mode: At a high level,
                                            indicates that the printer is
                                            in select mode (data reception
                                            possible).

  14       NC                               Tandy mode
                                            IBM mode
           AUTO LF -N                       Signal ground
  16       OV

  17       CHASSIS GROUND  FRAME GROUND

  18       +5V             FROM PRINTER     Tandy Mode: +5V power supply
                                            (Max. 50 mA)
           NC              --               IBM mode

  19-30    OV                               Twisted pair return (for pins
                                            #1 through 11).

  31       NC              --               Tandy mode
           INPUT PRIME-N   TO PRINTER       IBM Mode:When this goes low, 
                                            the printer control section is 
                                            initialized. The low level 
                                            period should be more than 0.5 
                                            ms.

  32       FAULT-N         FROM PRINTER     This signal goes from high to 
                                            low lever when paper end.

  33       INIT            TO PRINTER       Tandy Mode
           OV              --               IBM Mode

15,34      NC              --               Unused pine (No connection)

  35       NC              --               Tandy Mode
           Pulled High     --               IBM Mode

  36       NC              --               Tandy Mode
           SLCTIN-N        --               IBM Mode

* IBM interface mode is achieved by moving jumpers located inside the print-
er. See your local Radio Shack Service Center for this change.

* Parallel Interface Level

  low level  0.0V ~ +0.8V
 high level +2.4V ~ +5.0V

(jlc-07/26/93)