Connect Tech CANpro/104-Plus - Manual (Page 10)

CANpro/104-Plus Opto User Manual
CTIM-00052 Revision 0.00 4/23/2009 www.connecttech.com 10
800-426-8979 | 519-836-1291
Figure 5: Example CANpro/104-Plus Opto in the middle of the CAN bus
NOTE:
The 120 Ohm termination jumper does not need to be installed
in this situation.
Slew Rate Control Jumpers
Installing a jumper on J2 or J5 (see Figure 3 ) will disable slew rate limiting for the associated CAN port. Slew
rate limiting will reduce the emitted switching noise that is sent out onto the CAN bus lines and radiated from
those lines. Switching noise may cause EMI/EMC incompatibilities depending on the cabling used to support
the system. The use of slew rate limiting may aid in a system that is nearing the maximum limit of emissions.
Properly shielded cabling will also dramatically reduce emissions. Slew rate limiting may only be used on
busses operating at slower baud rates. With the jumper installed, full 1Mbps operation is possible.
DB-9 Frame Ground Connect
CANpro/104-Plus Opto models that have DB-9 connectors, will allow you optionally enable the Frame
Ground to be tied to ports isolated ground plane with J3 and J6.