User`s guide

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(3) Error processing

The following characters are printed when an error occurs.

? (3FH) : Framing error

! (21H) : Parity error

* (2AH) : Overrun error

Turn the power off and check computer and DPU-414 SWDIP switch

settings.

 Always power OFF the printer before the host computer. Powering

OFF the computer before the printer may cause the printer to print

several lines of "?" due to a FLAMING ERROR triggered by an

unstable signal output from the computer at power OFF. It does

not imply a printer malfunction.

(4) Signal Conditions

Standard

Item

Min. Typ. Max.

Unit

Input : Low Level Voltage -15.0



-3.0 V

Input : High Level Voltage 3.0



15.0 V

Output : Low Level Voltage



-12.0



Output : High Level Voltage



12.0



NOTE