Vishay G4-DT, Technical Manual, Page: 136 / 174

Technical Manual
7-44
Examples
Example 1: Setting ‘Level 1 Value’ to 123.5 (Writing to float value register).
1. Make sure that the previous command was not 251. Set command byte (00) to 0 if
previous command was 251.
2. Set number of registers (2) to write in byte 01.
3. Set start address (46010) in bytes 02 and 03.
See ‘7 Communication – Modbus protocol – General registers’.
4. Set the following four bytes (04 – 07) to the value to write (123.5).
5. Enter the command (251) in byte 00.
Byte Description Dec Hex
00 Command 251 FB
01 Number of registers to write 2 02
02 – 03 Start address 46010 B3 6A
04 – 07 Value to write in register 1 and 2 123.5 42 F7 00 00
08 – 15 Write registers 3 – 6.
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Example 2: Setting ‘Level 14 value’ to 123.5 (Writing to integer value register).
1. Make sure that the previous command was not 251. Set command byte (00) to 0 if
previous command was 251.
2. Set number of registers (3) to write in byte 01.
3. Set start address (42049) in bytes 02 and 03.
See ‘7 Communication – Modbus protocol – General registers’.
4. Set the following four bytes (04 – 07) to the value to write (123.50) i.e. 12350 and
two decimals.
5. Set bytes 08 and 09 to number of decimals. In this example is 2 decimals used.
6. Enter the command (251) in byte 00.
Byte Description Dec Hex
00 Command 251 FB
01 Number of registers to write 3 03
02 – 03 Start address 42049 A4 41
04 – 07 Value to write in register 1 and 2 12350 00 00 30 3E
08 – 09 Value to write to register 3 2 00 02
10 – 15 Write registers 4 – 6.
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