Ampcontrol VAA, User Manual

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VOICECOM USER MANUAL ISSUE 4
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This data has been divided into two Data Banks: Bank 0 (zero) and Bank 1. Each bank contains four bytes of data.
These banks are:
Byte Bank 0 Bank 1
1 Line Voltage Volume
2 Battery Voltage Threshold
3 Battery Current VAA Serial Number High Byte
4 Charging Current VAA Serial Number Low Byte
Data for all VAAs can be read, but only one Data Bank at any one time.

LINE 1 VAA data is read from Modbus addresses 68 to 191 (HEX 44 to BF)

LINE 2 VAA data is read from Modbus addresses 196 to 319 (HEX C4 to 13F)
It can be seen from the data table that there are four bytes per VAA. To set what data appears in those bytes, the
desired bank number must be written to Modbus address 1, the VAA data bank select control word:

Bank 0 – write 0 (zero) to Modbus address 1

Bank 1 – write 1 to Modbus address 1