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iDP3310 User's Manual
27 CITIZEN
7.3 Input and Output Signals
7.3.1 Input and Output Signals
(1) RD
Serial receiving data signal. On occurrence of framing error, overrun error, or parity error, the data is
canceled.
(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
If a command is received, which requests the printer condition or printer status, the corresponding 1-byte
data will be output.
(4) DSR
If this signal is a Space, the data will be sent from the printer side. Note that if this signal is a Mark when
a request to send command is executed, the printer will wait until the signal becomes a Space.
(5) FG
This is a Frame Ground.
(6) GND
This is a common ground on the circuit.