Citizen iDP-460 User Manual download pdf (Page 36)

iDP-460 User’s Manual

22 CITIZEN

7.3 Input and Output Signals

7.3.1 Input and Output Signals

(1) RD

This is a serial received data signal. When a framing error, overrun error, or parity error occurs, that

data is printed as "?" or discarded. (Depends on DIP switch selection.) The ERROR lamp is

illuminated.

(2) DTR

When this signal is Ready, write the data or a command. If written at the time of Busy, an overrun

error results, ignoring the previous data. The data can be written in the input buffer even during

printing. Busy is also issued at the time of power -on, test print, on-line, and reset.

(3) TD

When a command is received, that requests the printer state and printer status, 1-byte corresponding

data is output.

(4) DSR

When this signal is a space, the data is 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 signal.

(5) GND

This is a common ground on the circuit.

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Citizen iDP-460 User Manual Page 36