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iDP3210 User’s Manual
27
CITIZEN
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.