Datamax-O'Neil H-Class GPIO Option User Manual
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COM C (J4)
Recognized by the printer as Serial Port C, COM C functions as an auxiliary RS-232
interface or dedicated device port for the RFID and Linear Scanner options. Pin
assignments for the port are as follows:
Pin Number
COM C (J4)
1
+5V (@ .5 amps)
2 RX
3 TX
4 DTR
5 Ground
6 Ground
7 RTS
8 CTS
9 N/C
At default settings, the COM C port automatically selects its function. To force a
selection, however, change the jumper settings as denoted in the table below:
COM C Jumper Setting Functions
Jumper and Setting
Selected Function
JMP 12
JMP 13
JMP 14
JMP 15
RS-232 Communications (default)
On On On On
RFID Off
On
On
On
Linear Scanner
On
Off
On
On
Note: Jumper settings override menu settings: If set for RS-232 (default) with
the RFID and Linear Scanner menu-enabled, the printer will assign RFID to
Serial Port B (back plane port J13) and the Linear Scanner to the COM C
port.
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COM D (J3)
Recognized by the printer as Serial Port D, COM D is an auxiliary RS-232 interface.
Pin assignments for the port are as follows:
Pin Number
COM D (J3)
1
+5V (@ .5 amps)
2 RTS
3 Ground
4 TX
5 RX
6 Ground
7 CTS
8 DTR