Programmer's Notes - TransAct Ithaca 280 Programmer's Manual

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Communications iTherm 280 Programmer's Guide

Programmer's Notes

When the serial port is used, it is important that the output lines from the printer not be
shorted or back driven. If the signals are not to be used, they should be left open.
Pins 3, 4, and 7 (of the 9 pin connector) are outputs from the printer. If any one of these
signals is grounded or back driven, the other two outputs will be degraded.
The best time to configure the printer by the host with remote configuration is during
system setup or software update.
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