MagTek MT-215 TTL SINGLE OR DUAL HEAD - Manual (Page 15)

Section 2. Installation
9
Figure 2-3. Board Layout and Cable Connections
Note
The jumpers shown in Figure 2-3 are used only on the old PCB
assembly (21063528); there are no jumpers on the new PCB
assembly (21063548).
J3 Connector for P/N 21065113 is a 9-pin connector with pins 10
& 11 removed.