Datamax E-Class Mark II Programmer's Manual page 276

Appendix J – General Purpose Input Output Port Applications
COM C (J4)
Serial Port C functions as an RS-232 interface or as a dedicated device interface, according
to jumper setting configurations indicated below:
Function
RS-232 Communications
RFID
Linear Scanner
Remote Display
Jumper settings will override most printer menu settings; however, if COM C jumpers

are set for RS-232 communications with both the RFID and Linear Scanner options
menu-enabled the printer will automatically assign the Linear Scanner to COM C (J4).
COM D (J3)
Serial Port D is an RS-232 communications interface.
Indicators:
Real-time incoming (IN) and outgoing (OUT) signal activity can be observed via LEDs on the
card bracket. Sampled every millisecond, color change occurs with a corresponding change
of signal state.

Unused, non-connected inputs and outputs will have an indeterminate state and assume a
value of 1 or 0.
Class Series 2 Programmer's Manual
COM C Jumper Setting Functions
JMP 12
On
Off
On
On
Signal In
Signal Out
Position
JMP 13 JMP 14
On On
On On
Off On
On Off
JMP 15
On
On
On
On
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