Rev A

RBCAND21 SERIES

CAN Isolation Transceiver Module

Industrial Bus

12/5/2017

Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 •

Fax 603-778-9797

website: www.wallindustries.com • e-mail: sales@wallindustries.com

Page 4 of 5

Fig. 2

As shown in Figure 2, a single CAN-bus network can connect up to 110 single-channel RBCAN isolated CAN transceiver modules. The universal type

module can support a max. communication distance of 10km while the high-speed type module can support a max communication distance of 1km with

baud rate beyond 40kbps. If looking to access more nodes or longer communication distance, it can be achieved by using CAN repeaters or other

expansion equipment.

Notes: The communication distance of the bus is related to the communication speed and field application. It can be designed according to the actual

application and reference standard. It is recommended that the communication cable is a twisted pair or shielded twisted pair and should stay away from

the interference source. For long-distance communication, the terminal resistance value needs to be selected according to the communication distance

and the cable impedance and the number of nodes.

Fig. 3

Components

Parameter

C1 C2

1uF/16V

LDM

CD43-12uH

2. Recommended Port Protection Circuit

Fig. 4

Note: Twisted pair shield grounded reliably.

Parameter declaration:

Components

Recommended Parameters

Components

Recommended Parameters

R3

1MΩ

R1, R2

2.7Ω/2W

C1

102,2kV

D1, D2

1N4007

T1

ACM2520-301-2P

D3

SMBJ15CA

GDT

B3D090L

When the module is used in harsh field environment, it is susceptible to the large energy of lightning strike. In this case, it is necessary to add protection

circuit to the CAN signal port to protect the module from damage and ensure the reliability of bus communication. Figure 2 provides a recommended

protection circuit design for the high-energy lightning surges, with a degree of protection related to the selected protection device. Parameter description

lists a set of recommended circuit parameters, which can be adjusted according to the actual application situation. Also, when using the shielded cable,

the reliable single-point grounding of the shield must be achieved.

Note: This recommended parameter is only the recommended value, which is subject to the actual application. Recommended R1, R2 use PTC, D1, D2

use fast recovery diodes.