Page 1-14 110XiIIIPlus Maintenance Manual 13185L-002 Rev. A 1/24/06
Section 1 System Description
Refer to Figure 1-10. RS-422 and RS-485 data signals are also either Mark or Space. The
voltage levels are +5 VDC and 0 VDC when monitored from a specified reference point.
The levels for the printer, when referenced to signal ground, are:
RS-422 and RS-485 Transmit and Receive Data
Mark Output/Input A = +5 V and Output/Input B = 0 V
Space Output/Input A = 0 V and Output/Input B = +5 V
Figure 1-10. RS-422 and RS-485 Signaling
Communication Code
The printer sends and receives ASCII (American Standard Code for Information
Interchange) characters in one of two formats, Serial Data or Parallel Data.
Parallel Data Communications Interface Overview
A standard 36-pin parallel connector is available at the rear of the printer for connection to
the data source. Under normal circumstances, data sent from the printer to the host in
response to a Printer Status Request command is sent through the RS-232 serial port.
However, if the host has a properly configured IEEE-1284 parallel port that is recognized
by the printer, status information is returned through the parallel port. Port selection for
status information is determined each time the printer is turned On (l).
Logic 0
Logic 1
(Idle)
– Mark
+ Space
Start
Bit
Data Bits
Parity
Bit
Stop
Bit
(Idle)
12
3
4
5
6
7
Note • When using the serial data format, the baud rate, number of data and
stop bits per character, and parity are selectable. Parity applies only to data
transmitted by the printer. For received data, the parity bit is ignored.
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