Input And Output Signals - Citizen iDP-460 User Manual

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.
iDP-460 User's Manual