7.3
Input and Output Signals
7.3.1
Input and Output Signals
(1) RXD
Serial received data signal.
data will be printed as "?".
(2) DTR
Write the data or a command when this signal is Ready.
ignored, resulting in an overrun error.
Busy is also issued at power-on, during test printing, at on-line, or at reset.
(3) TXD
If the remaining capacity of the input buffer comes to 128 bytes or less while receiving the data,
DC3(13H) will be output as a data not receivable signal.
or more, DC1(11H) will be output to the host side as a data receivable signal.
When sending the status information, it is confirmed that DSR is a space prior to sending the data, if
DTR/DSR control has been selected.
ignoring the DSR signal.
(4) FG
Ground for the case
(5) GND
Common ground for the circuits
If a framing error, overrun error, or parity error takes place, the relevant
The data can be written in the input buffer even during printing.
If DTR/DSR control has not been selected, the data will be sent,
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CBM-270 User's Manual
If you write at Busy, the previous data will be
If the remaining capacity comes to 256 bytes
CITIZEN