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Ap1310-DC User Guide Page 9 of 13
7 INTERFACE DETAILS
7.1 RS-232 SERIAL INTERFACE
The Ap1310-DC printer has an industry standard RS-232 interface. The default parameters are 9600
baud, 8 data bits, 1 stop bit and no parity. Other baud rates can be programmed by control codes, or
by using a setup utility available from the factory.
Serial data is expected in standard RS-232C format with -12V meaning 'mark' or '1' and +12V a
logical '0', with reference to the common ground. The serial data output line, TxD, transmits
XON/XOFF and status information to the host at the same Baud rate and in the same format as the
serial data input. The hardware busy line is true (nominal -12V) when busy. Both serial output lines
will relax to approximately 0V when the Ap1310-DC is off, and the user must allow a short period after
switching on before relying on the values of these signals.
Some host equipment use a constant space condition (+12V) to indicate a reset condition or wait
state. Some battery powered host equipment present the same output signal when they go to sleep.
The Ap1310-DC can be set to ignore this condition as detailed in the Programmer’s Guide, but even
then this type of host behaviour may result in one or more spurious characters being received and
printed.