Datamax-O'Neil A-Class Mark II Operator’s Manual - Manual (Page 24)

14 A-Class Mark II
3. Slide the Main Board out of the printer then move the jumpers according application:
•
For RS-422/485 operation, place the jumper across pins E4 and E5;
•
For +5VDC on Pin 1, place the jumper across pins E1 and E2; or,
• For RS-232 operation (default), place the jumper across pins E5 and E6;
• For no voltage on Pin 1 (default), place the jumper across pins E2 and E3.
Communications Jumpers
+5 Volt Jumper
4. Slide the Main Board into the printer and secure it with the
two previously removed Screws.
5. Connect communication cables to the Main Board and plug in
the power cord
For RS-422/485 communications, ensure that your cable meets
the requirements (per the table, right) for proper data transfer.
Serial Port
Pin Number
RS-422 & RS-485
Function
1 ---
2 RX-
3 TX+
4 ---
5 GND
6 ---
7 TX-
8 RX+
9 ---