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5
Data Link layer
Modbus uses master/slave protocol where there is a single master device that initiates all messages. The Data Link
layer defines the reliable transfer of a message transferred from the master to one or more slave devices and the
reliable transfer of the response message (when the command message is sent to a single device). The
CoreSense Diagnostics module is a slave in the network and the rack controller is the master.
5.1
Node address
The DIP-switch setting combination gives the node address. Combination positions 1 to 6 will be used to define a
node address from 1 to 62. Positions 7 to 12 will be used for Baud rate, parity, network mode, discharge
temperature protection, self-test mode, and VFD enable (Variable Frequency Drive).
Figure 6: Switches 1 to 6 are used to set the module Modbus address
See
Table 1 and Tables 3 to 9
for more information about setting the DIP-switches.
Figure 7: Default jumper settings on the CoreSense module
ON
1
2
3
4
5
6
7
8
9
10
11
12
