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Honeywell UDC1700 controllers (probably generally UDC1xxx):
The basic parameters and current data of these controllers are not normally read by means of functions 0x01 up to 0x04. It is necessary to use the function functions 0x14/0x15 Read/write configuration reference data. These controllers use "big-endian" byte order. Therefore, for proper functionality, it is not necessary to modify parameters that change byte mode and endianness.
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20.039 - 16-bit number from address 39(0x27) f20.040 - 32-bit real number from address 40(0x28)
Note: Honeywell-made products (UDC 2xxx/3xxx, HC900, DPR, Trendview) use the common Modbus function codes 1-4 in spite of the UDC manuals referring only to 0x14/0x15 Read/write configuration reference data register tables. For more detailed information, see this post.
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