iDP-3535 User’s Manual
CITIZEN 20/38
5-5 Error Detection
The printer detects Parity, Framing and Overrun Error.
When any error is detected, the data is printed out as (7FH).
Framing Error;
Framing error occurs when SPACE signal is checked out at STOP BIT and the printer print out (7FH).
Parity Error;
Parity check is carried out only when user designates it on the printer pre-setting.
Input Control and Buffering; (over-run-error)
The printer is designed to output DTR signals for each word. If the host computer neglects DTR signal and
transmits the data, it may cause the “OVER-RUN ERROR”.
In order to avoid such case, set up the host computer to observe DTR signals from the printer by following
the connector pin assignments described in 5-2.
Other errors
When an error is detected at the printer mechanism, SEL / ALARM light is flickered.
FAULT signal becomes SPACE states, DTR signal becomes BUSY status. Then printer becomes OFF LINE.
After the error is corrected, SEL / ALARM light becomes off by pushing SEL switch.
The reception of data is resumed when SEL switch is pushed again.