MBMap Registry
  1. Devices
  2. Alfa Instrumentos
  3. 3100D / 3100DS

Alfa Instrumentos 3100D / 3100DS Modbus register map

Also covers 3104D, 3107D, 3104DS, 3107DS

Weighing indicators with Modbus RTU and Modbus TCP

  • Unofficial
  • 62 registers
  • Modbus TCP and RTU
  • Revision 1 · 2026-10-18

Unofficial: Copied from an unofficial source and not tested. Read it as a draft and check a value on the real device before you rely on the rest. Check the map against the manufacturer's documentation before you write to a live device. Tested it? Report a test.

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Communication

Protocol
Modbus TCP and RTU
Unit ID
1
TCP port
502default
Serial
9600 8N1 · 9600 baud, 8 data bits, none parity, 1 stop bit
Byte / word order
ABCD · bytes big-endian, words high first
Addresses
0-based

Connection values are defaults: the device may be configured differently.

Map

Registers
62 holding registers
Groups
4
Translation tables
5
Revision
1 · 2026-10-18
Added
()
File
maps/alfa-instrumentos/3100d-3100ds.mbmap.json · 13 KB · history
SHA-256
df2cc7241747aa79685e56ffc277e0309acaf5f0e431860c94b96b64a17a1ccb
Manufacturer
alfainstrumentos.com.br

Sources and notes

Source: Alfa Instrumentos user manual 0132-MN-03, 3100D/DS weighing indicators, Modbus TCP commands

  • The manual says the Modbus TCP commands keep the structure of the Modbus RTU ones; the RTU command manual 0060MN was not available, so this map follows section 6.1 of 0132-MN-03.
  • Registers are numbered as in the manual, which gives the same number in decimal and in hexadecimal start addresses (register 80 is 0x0050).
  • Supported functions: 0x03 read, 0x06 write one register, 0x10 write several registers.
  • The weight and tare are 32-bit counts; the manual does not state the word order (big assumed), the sign (a separate flag in register 80) or a scale. Divide by 10 to the power of the decimal places in bits 0 to 2 of register 80.
  • Registers 160 to 165 set the clock together with function 0x10; the manual lists register 163 as hour and the quantity as 6.
  • The manual gives the editable tare as start register 850 with quantity 2 but names registers 851 and 852; 851 and 852 are used here.
  • Serial defaults: 8 data bits, no parity, 2 stop bits; baud rates 4800 to 230400. Factory device address 01.
  • Level numbering: values and states are given for levels 0 to 7 depending on the model (3104D/DS has 4 levels, 3107D/DS has 8).
AreaAddressNameTypeAccessUnitScaleDescription
HR 80 bool bit 3 R
HR 80 bool bit 4 R
HR 80 bool bit 5 R
HR 80 bool bit 6 R
HR 80 bool bit 8 R
HR 80 uint16 bits 0–2 R Bits 0 to 2: decimals of the weight and tare values
HR 80 uint16 bits 9–12 R Bits 9 to 12
HR 81 bool bit 0 R
HR 81 bool bit 1 R
HR 81 bool bit 2 R
HR 81 bool bit 3 R
HR 81 bool bit 8 R
HR 81 bool bit 9 R
HR 81 bool bit 10 R
HR 81 bool bit 11 R
HR 81 bool bit 5 R 0 = net, 1 = gross
HR 81 bool bit 4 R
HR 82 uint32 ABCD R Count in the unit and decimals of register 80
HR 84 uint32 ABCD R Count in the unit and decimals of register 80
HR 40 bool bit 7 R 0 = levels 0 to 3, 1 = levels 4 to 7
HR 41 uint32 ABCD R Level 1 when the bank bit is 0, level 4 when 1
HR 43 uint32 ABCD R
HR 45 uint32 ABCD R
HR 47 uint32 ABCD R
HR 60 uint16 R
HR 61 bool bit 0 R 0 = normally open, 1 = normally closed
HR 63 bool bit 0 R 0 = does not latch, 1 = latches
HR 63 bool bit 1 R 0 = does not latch, 1 = latches
HR 64 bool bit 0 R 0 = does not latch, 1 = latches
HR 64 bool bit 1 R 0 = does not latch, 1 = latches
HR 65 bool bit 0 R 0 = does not latch, 1 = latches
HR 65 bool bit 1 R 0 = does not latch, 1 = latches
HR 65 bool bit 2 R 0 = does not latch, 1 = latches
HR 30 uint16 W Write before the level values: bit 6 = store, bit 9 set = levels 4 to 7, bit 10 set = levels 0 to 3
HR 31 uint32 ABCD W
HR 33 uint32 ABCD W
HR 35 uint32 ABCD W
HR 37 uint32 ABCD W
HR 90 bool bit 0 W Write 1 to run (bit 0 of the remote command register)
HR 90 bool bit 1 W Write 1 to run (bit 1 of the remote command register)
HR 90 bool bit 2 W Write 1 to run (bit 2 of the remote command register)
HR 90 bool bit 3 W Write 1 to run (bit 3 of the remote command register)
HR 90 bool bit 4 W Write 1 to run (bit 4 of the remote command register)
HR 90 bool bit 5 W Write 1 to run (bit 5 of the remote command register)
HR 90 bool bit 6 W Write 1 to run (bit 6 of the remote command register)
HR 230 uint16 W Bits 0 and 1 select automatic and manual zero; bit 8 enables initial zero
HR 250 uint16 W
HR 270 uint16 W
HR 851 uint32 ABCD W Value used when the tare mode is editable
HR 170 uint16 R
HR 171 uint16 R
HR 172 uint16 R
HR 173 uint16 R
HR 174 uint16 R
HR 175 uint16 R
HR 176 uint16 R
HR 160 uint16 W Write the six registers 160 to 165 together (function 0x10)
HR 161 uint16 W Write the six registers 160 to 165 together (function 0x10)
HR 162 uint16 W Write the six registers 160 to 165 together (function 0x10) Year has the last two digits.
HR 163 uint16 W Write the six registers 160 to 165 together (function 0x10)
HR 164 uint16 W Write the six registers 160 to 165 together (function 0x10)
HR 165 uint16 W Write the six registers 160 to 165 together (function 0x10)

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