User guide

Parallel Data Port
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57512L-004 Rev. A 110PAX4/R110PAX4 User Guide 6/29/11
Parallel Data Port
The parallel data interface supports IEEE 1284 bidirectional parallel communications in nibble
mode. The parallel interface provides a means of communication that typically is faster than
the serial interface methods. In this method, the bits of data that make up a character are sent
all at one time over several wires in the cable, one bit per wire.
When communicating via the parallel port, the values selected on the print engine must be the
same as those used by the host equipment connected to the print engine. Port selection for
status information is determined by the channel sending the request. The parallel port can be
set for bidirectional or unidirectional communication. The default setting is bidirectional.
Parallel Cabling Requirements
A standard 36-pin parallel connector is available on the back of the print engine for connection
to the data source. An IEEE-1284 compatible bidirectional parallel data cable is required when
this communication method is used. The required cable must have a standard 36-pin parallel
connector on one end that is plugged into the mating connector located at the rear of the
print engine. The other end of the cable connects to the print engine connector at the host
computer. Port selection for status information is determined each time the print engine is
turned on.
Parallel Port Interconnections
Table 18 shows the pin configuration and function of a standard computer-to-printer parallel
cable.
Table 18 • Parallel Cable Pin Configuration
36-Pin Connectors Description
1 nStrobe/HostClk
2–9 Data Bits 1–8
10 nACK/PtrClk
11 Busy/PtrBusy
12 PError/ACKDataReq
13 Select/Xflag
14 nAutoFd/HostBusy
15 Not used
16, 17 Ground
18 +5 V at 750 mA
The maximum current draw may be limited by option
configuration.
To enable this capability, a qualified service technician
must install a jumper on the print engine’s main logic
board on JP1, pins 2 and 3.