Nortech Systems RS-232/TERM User Manual

DeviceNet allows different connectors, which may be grouped into open and sealed 
connectors. The open connectors are available with screw or with crimp connectors. The 
sealed connectors are available in mini-style and micro-style sizes. See 

 for more details.

The DeviceNet network uses the Controller Area network (CAN) bus as the physical 
layer. This requires that the trunk line of your DeviceNet network be terminated with a 
resistor at each end. This terminates the signal lines. 

The terminating resistor:

• Prevents reflection of communication signals on the network.

• Connects the two signal conductors.

• Must be sealed if the end node uses a sealed tee.

• Must be open if the end node uses an open-style tap. 

When using the open-style terminating resistor, connect a 121ohms, 1/4W resistor to 
CAN_H and CAN_L (between blue and white data-pair wires).

NOTE: A terminating resistor must also be used whenever a short drop 
line exceeds 6m (20 ft.).

Open plugable

Uses screws to attach cable wires to a removable 
connector

Open hard-wire 

Uses wires attached directly to screw terminals

Sealed mini-style

Attaches to taps and thick or thin cable

Sealed style micro

Attaches to thin cable only – has a reduced 
current rating

Unsealed 
Screw 
Connector

Unsealed 
Hard Wired

Sealed 
Mini-Style 

Sealed 
Micro-Style 
Connector