Microcom 424 Operator's Manual page 62

Printer Commands
The ^D68 is a nonvolatile command used to enable which GP outputs
are active. The outputs are entered in as a HEX value that is equal to a
binary number with the outputs in the following order; 4321.
Command Syntax:
^D68<CR>0n<CR>
n = the hex value from 0 to F.
Example: If the application wanted to configure outputs 1 and 3 active,
a ^D68<CR>05<CR> command (the <CR> indicates carriage return
characters) would be issued. The printer ignores the LF characters, so
a <CR+LF> is interpreted as a <CR> as well) would be sent to the
printer.
NOTE: A status request (^E, ^D5, or 5 NULLs 01) will never show the
status of the outputs while a status request will show the input status if:
1) GP I/O is enabled AND
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 MTA50 AMP part number
#1445350-8 and Microcom Corporation part number 510188-0008.
The pin out is as follows (the square pad denotes pin one on the PCB):
Connector P17 is the input port.
5-14
1 = ground
2 = g/p input 1
3 = ground
4 = g/p input 2
5 = ground
6 = g/p input 3
7 = ground
8 = g/p input 4
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Chapter 5