Gossen IPP 144 - 40 GE User Manual download pdf (Page 33)

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.

RTS / DTR

The addressing protocol is:

<Ctrl E> address <Ctrl E> characters ...<CR> <Ctrl D>

A text of more than one line is possible.

( <Ctrl E>, <Ctrl D>, see appendix).

A transmission is only accepted if the sequence <Ctrl E>

address <Ctrl E> is used !

e.g. print date/time/text:

<Ctrl E> address <Ctrl E> <Ctrl \> <CR> characters...

Protocol &

Text

Address / ASCII character assignment example:

Address Address in corresponding

Protocol (HEX) ASCII - character

0 - without addressing

1311

. . .

30 4 E N

31 4 F O

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 63 64

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Gossen IPP 144 - 40 GE User Manual Page 33