Specifications

Programmer’s Guide Model 181 Series 180 Communications
TransAct Technologies
09/26/2000 Page 8 - 3
PARALLEL INTERFACE
PARALLEL INTERFACE SPECIFICATION (P1284)
Parallel Protocol
The Model 82 uses a standard PC-compatible parallel interface. The following
illustration shows the timing diagram for the interface protocol.
Compatibility Mode:
Busy
Acknowledge(L) pin 10
.5uS
Strobe
Data(pins 9-2)
Ts .5uS Th
Th = Ts = .5uSec min.
1. The Host places its data on the data lines.
2. The host strobes the data into the printer latch using Strobe(L)
3. The printer Goes Busy(H) until the printer is ready to receive the next byte.
4. The printer acknowledges receipt of the data byte by Pulsing ACK(L).
5. The printer removes Bush(H) to allow continuation of data flow.
Note:
Definition and timing of the Parallel P1284 interface is beyond the scope of this manual,
for a complete description of this interface refer to the IEEE P1284 Specification.
PARALLEL TECHNICAL SPECIFICATIONS
This table describes the pin settings for the Parallel interface.
Pin 1 Strobe Clock Data to printer Host to Printer
Pin 2-9 D0-D7 Data Host to Printer
Pin 10 ACK(L) Printer Accepted Data Printer to Host
Pin 11 Busy Printer is Busy Printer to Host
Pin 12 PE Paper Out / Status Printer to Host
Pin 13 SLCT Printer Selected Printer to Host
Pin 14 AUTOFD Auto feed paper Host to Printer
Pin 15 ERR(L) Printer Error Printer to Host
Pin 16 INIT(L) Initialize the Printer Host to Printer
Pin 17 SLIN Select Printer Host to Printer
Pin 18-25 GND Ground