— 33 —
(2) TTL circuit (PE/RESET/FAULT)
Input (RESET)
The input signal level is TTL level.
“HIGH” level: 2.4 V MIN
“LOW” level: 0.4 V MAX
Output (RE/FAULT)
The output signal level is TTL level.
“HIGH” level: 2.4 V MIN
“LOW” level: 0.4 V MAX
5K
104
10K
RESET
(7406 compatible)
PE/FAULT
(HC05 compatible)
6.5 Error Detection
This printer detects the following communication errors in the data communication
of serial interface. When any error occurs, the printer converts (or may ignore in
some case) the data at the occurrence of the error to the characters set by the memory
switch and then prints the characters.
•Parity error
Parity error occurs when parity check is specified and parity is not observed in
the even and odd parity checks.
•Framing error
When space state detected on detection of stop bit.
•Overrun error
This error occurs when next data is transferred to receiving buffer though input
buffer is full of data.
RECEIVING CONTROL AND BUFFERING
This equipment controls, on receipt of print data, receiving (DTR Control) in one-word
unit. If the host disregards DTR and carries out data transmission at this time, over-
run of receiving data may be resulted. This state should be avoided on the host’s
responsibility. (The data discharging type host cannot follow this.)