Canopen Interface; Can Bus Network Topology - Whisper Power Power Plus User Manual

Figure 8. Four Lithium Power Plus batteries in a series - parallel connection with external relay

4.7. CANopen interface

The CANopen interface of the Lithium Power Plus battery must be used for CAN
balancing and can be used for monitoring purposes.
The Lithium Power Plus battery can be monitored using the Battery Monitor soft-
ware and the Touch Display Screen. (see paragraph 2.8.2)
To use the Battery Monitoring Software, the CAN bus of the Lithium Power Plus
battery (CON 3) needs to be connected by means of CAN-to-USB interface to the
computer on which the monitoring software and the usb drivers are installed.
More information about the CANopen bus can be found at the CiA website:
www.can-cia.org.

4.7.1. CAN Bus network topology

The CAN Bus must be used in a bus network topology. Do not use a ring- or a star topology.
The maximum CAN bus legnth is limitted because the Lithium Power Plus battery has a
fixed bitrate of 250kbps.
In Table 12 is an overview of these restrictions.
Bit rate
250 kbps
Table 12. CAN bus speed
WhisperPower Lithium Power Plus 12 V 105 Ah
Bus length (L) Max. stub length (S)
250 m 11 m
Fuse
Accumulated stub length
55 m
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