COMMELL MPX-2515 - Manual (Page 32)

Commell MPX-2515 User’s Guide Rev 0101
Taiwan Commate Computer Inc. 32
Figure 31 MPX-2515 Card Connects to CAN bus
Line Termination
It's important that you need to enable the Line Termination provided on the MPX-
2515 card if you are happening to connect the MPX-2515 card to the end of a CAN
bus networking. Users enable/disable the line termination by closing/opening the Line
Termination Jumper on the MPX-2515 card.
Line Termination
For high-speed CAN, both ends of the pair of signal wires (CAN_H and CAN_L)
must be terminated. The termination resistors on a cable should match the
nominal impedance of the cable. ISO 11989 requires a cable with a nominal
impedance of 120 Ohm. MPX-2515 card provides 120 Ohm resistor for
termination. Users enable/disable 120 Ohm line termination by closing/opening
the jumper.