Connect Tech CANpro/104-Plus - Manual (Page 9)

CANpro/104-Plus Opto User Manual
9 www.connecttech.com CTIM-00052 Revision 0.00 4/23/2009
800-426-8979 | 519-836-1291
On-Board Jumper Configuration
Figure 3: CAN Ports and Jumper Locations
120 Ohm Termination Jumpers
Jumpers J1 and J4 will enable a 120 Ohm termination resistor across the CAN-H and CAN-L lines.
Termination is always recommended for improved signal integrity, especially for long transmission lines.
Termination requirements should be evaluated on a case by case basis. Typically both ends of a CAN bus are
terminated, but termination is not enabled on cards that sit in the middle of the bus. See
Figure 4 and Figure 5
for examples that indicate when to use this jumper selection.
Figure 4: Example – CANpro/104-Plus Opto at the end of a CAN bus
NOTE:
The 120 Ohm termination jumper must be installed in this
situation.