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iDP-3210 User’s Manual
CITIZEN
39
6.2.3 I/O SIGNALS
(1) RD
Serial receiving data signal. On occurrence of framing error, overrun error, or parity error,
the data is printed as "?".
(2) DTR
When this signal is READY, write data or a command. When they are written in
BUSY, overrun error is occurred and data is ignored. Even during printing, data can be
loaded in the input buffer. Further, BUSY can take place on supply of power, during test
printing, during on-line, or on resetting.
(3) TD
When, while in data reception, the input buffer on the printer side has only 128 bytes .or less left,DC3
(13H) data reception impossible signals are output. When the input buffer has 256 bytes
left, DC1 (11H) data reception possible signals are output to the host. When DTR/DSR
control having been selected in status information transmission, it is first confirmed that
DSR is "space" and data is sent. When DTR/DSR control has not been selected, DSR
is ignored and data is transmitted.
(4) FG
Case GND
(5) GND
Common GND on the circuit.