Gossen THERMAL GRAPHICS PRINTERS IPP 144 - 40 G User Manual
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7.3. Handshake Messages
Serial Interface
These lines indicate the printer status to the sender;
DTR (device is on) is rather insignificant and is in general
not used.
RTS high (+8 V) indicates: printer is ready to receive.
RTS low (-7 V) indicates: printer is not ready to receive.
The reasons for printer not being ready could be:
Out of paper
Print interval running
Buffer is full
Change menu
RTS / DTR are only used by the RS 232 C interface and
can be used for interface I and II.
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RTS / DTR
The addressing protocol is:
A text of more than one line is possible.
(
A transmission is only accepted if the sequence
address
e.g. print date/time/text:
Protocol &
Text
Address / ASCII character assignment example:
Address
Address in
corresponding
Protocol (HEX) ASCII - character
0
- without addressing
1
31
1
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30
4 E
N
31
4 F
O