Switch Settings - Citizen 120D+ User Manual

1. DATA busy: (One byte)
Busy control by character is done by using *DB (11 PIN).
This goes to HIGH level when the data can be received and
goes to LOW level when the data is sent form the host. As
the printer takes in the data, it goes to HIGH level again.
2. DTR busy:
Busy control is done by using DTR signal (20 PIN).
DTR will go to LOW Level if the remaining capacity of the
buffer gets less than 256 bytes.
DTR will go to HIGH level if the data in the buffer gets less
than 256 bytes.
3. X-ON/X-OFF:
X-OFF code (CHR$(19)) is sent to the host when the
remaining capacity of the buffer gets less than 256 bytes.
X-ON code (CHR$(17)) is sent to the host when the number
of data in the buffer gets less than 256 bytes.
Switch Settings
The internal switch is actually two sets of eight switches,
both them are labelled 1 through 8. Basically, one set of
swtiches labelled SW1 designates the 120D+ as either an
Epson FX/LX printer or an IBM Graphics printer, and the
other set of switches labelled SW2 designates the
specifications for serial data transfer.
Switches SW1-1,8
The selection of either Epson or IBM configurations and of
the various combinations of printer features that can be set
is explained in Appendix D as the operation of switch 1 on
the serial interface pack is identical to the only switch
available on the parallel interface pack.
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