✎ modbus [ПромАвтоматика]

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====== modbus ======

http://www.modbus.org/specs.php

====== Варианты запросов ======

**01** (0x01) Read Coils 
<code>
Request:  01 bbbb NNNN
Response: 01 nn <data>
Error:    81 ee
</code>

**02** (0x02) Read Discrete Inputs
<code>
Request:  02 bbbb NNNN
Response: 02 nn <data>
Error:    82 ee
</code>

**03** (0x03) Read Holding Registers
<code>
Request:  03 bbbb NNNN
Response: 03 nn <data>
Error:    83 ee
</code>

**04** (0x04) Read Input Registers
<code>
Request:  04 bbbb NNNN
Response: 04 nn <data>
Error:    84 ee
</code>

**05** (0x05) Write Single Coil
<code>
Request:  05 aaaa vvvv (0000 or FF00)
Response: 05 aaaa vvvv (0000 or FFFF)
Error:    85 ee
</code>

**06** (0x06) Write Single Register
<code>
Request:  06 aaaa vvvv 
Response: 06 aaaa vvvv 
Error:    86 ee
</code>

**07** (0x07) Read Exception Status (Serial Line only)
<code>
Request:  07  
Response: 07 vv
Error:    87 ee
</code>

**08** (0x08) Diagnostics (Serial Line only)
<code>
Request:  08 .......
Response: 08 .......
Error:    87 ee
</code>

**15** (0x0F) Write Multiple Coils
<code>
Request:  0F bbbb NNNN nn <data>
Response: 0F bbbb NNNN
Error:    8F ee
</code>

**16** (0x10) Write Multiple registers
<code>
Request:  0F bbbb NNNN nn <data>
Response: 0F bbbb NNNN
Error:    8F ee
</code>

<code>
</code>

<code>
</code>

<code>
</code>

<code>
</code>

<code>
</code>

<code>
</code>

====== Группировка ======
  - coils: r-1, w-15/5
  - discrete inputs: r-2
  - holding registers: r-3, w-16/6
  - input registers: r-4

====== Настройки устройства ======
  - max quantity of HOLDING registers in a reading request
  - max quantity of INPUT registers in a reading request
  - don't use WRITE_SINGLE_COIL command 0x05
  - don't use WRITE_SINGLE_REGISTER command 0x06
  - max size of gap in a reading request

====== Настройки тега ======
  - region:
    * COILS
    * DISCRETE_INPUTS
    * INPUT_REGISTERS
    * HOLDING_REGISTERS
  - address
  - data type
  - access:
    * read
    * write
    * rw
  - byte rearrangement
  - forced write with command 6   

====== Conf ======

<code yaml>
tag.reg1:
  name:     current.status
  type:     bool
            int     1 / 2 / 4
            [uint]    1 / 2 / 4
            float
            double
            string  1..~240
  size:     1 / [2] /  ... n
  reorder:  [10 32 54 65 87] / 32 10 76 54 / 76 54 32 10
  addr:     2001
  enable:   on
  access:   r / w / [rw]
  read:     1 / 2 / 3 / [4] 
  write:    5 / [6]
  writegr:  F / [10]
  
tag.reg1_b1b0:
  name:     current.error
  type:     bits
  bit:      0 .. 15
  size:     [1] .. 16
  
</code>