Microcom 438TM, Operator'S Manual

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Chapter 5 Printer Commands
438TM Operator’s Manual - 880049-0113 5-21
2) One or more bits have been configured to generate errors when
active AND
3) One or more of those halting bits have gone active and have
produced an error that has not been cleared.
NOTE: If the printer is not in the general purpose I/O mode, the inputs
status may still be read with the ^D150 command but the outputs
cannot be read (or written to) with the ^D69 or ^D68 commands.
NOTE: If an input has caused an error to be generated, then goes
inactive, and another print request received before the error is cleared,
the printer will not print and will remain in the error state. A status
request will show the active error inputs. This condition will remain until
the error is cleared.
NOTE: Default power up will disable I/O mode.
The P17 and P21 connectors are 8 pin mini Molex style connectors.
The pin out is as follows (the square pad denotes pin one on the PCB):
Connector P17 is the input port.
1 = ground
2 = g/p input 1 - Print
3 = ground
4 = g/p input 2 - Print Test Pattern
5 = ground
6 = g/p input 3 - Reset
7 = ground
8 = g/p input 4 - Abort Sync (Sync Reset)
All inputs are active high. 24.0 VDC = high 0.0 VDC = low
Connector P21 is the output port.
1 = ground
2 = g/p output 1 - Not printing (Low = Printing)
3 = ground
4 = g/p output 2 - Error
5 = ground
6 = g/p output 3 - Downloading a format
7 = ground
8 = g/p output 4 - Format loaded
All outputs are active high. 24.0 VDC = high 0.0 VDC = low