B&B Electronics GW-7433D - Manual - Manual (Page 17)

Therefore, the GW-7433D module supplies a jumper for users to
connect the terminator resistor or not. If users want to use this terminator
resistor, please open the GW-7433D cover and use the JP3 jumper to activate
the 120Ω terminator resistor built in the system, as in the figure 2.6. Note that
the default setting is active. And about the J3 jumper setting, please refer the
table 2-5.
Figure 2.6 XC100 I/O expansion board LAYOUT
Apply the termination resistor(120Ω) Don’t apply the termination resistor
Table 2-5 J3 Jumper Selection
GW-7433D MODBUS TCP/RTU to CANopen Gateway User Manual 17
(Version 2.0.0, Jul/2011)