====== 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>
module.owen1:
  enable:     on
  type:       'owen_trm210'
  mode:       [rtu] / ascii / tcp
  portnum:    1
  netaddr:    1
  retrial:    3
  emulated:   off
  descr:      good old owen trm 
  


modbustype.owen_trm210:
  enable:     on
  
  # максимальное количество регистров в команде
  func.reg.limit:
    1:  1 .. [175]
    2:  1 .. [175]
    3:  1 .. [175]
    4:  1 .. [175]
    15: 1 .. [175]
    16: 1 .. [175]
  
  # максимальный разрыв для команд записи
  func.write.gap:
    15: [0] .. 175
    16: [0] .. 175
  
  tag.reg1:
    enable:   on
    type:     bool
              int     size: 1 / [2] / 4
              [uint]  size: 1 / [2] / 4
              float
              double
              string  1..~240
    size:     1 / [2] /  ... n
    reorder:  [[]] / [0,1,2,3] / [1,0,3,2] / ...
    addr:     2001
    addrwr:   2002
    access:   r / w / [rw]
    coderd:   1 / 2 / 3 / [4] 
    codewr:   5 / [6]
    codegr:   15 / [16]
    req:      [off] / on  # если on, то создает два доп тега:
                          #    reg1.req
                          #    reg1.cnt
    
    reqgr:    [''] / 'mytestgroup'  # если не '', то создает теги:
                                    #   modname.mytestgroup.req =1
                                    #   modname.mytestgroup.cnt 
    
    bittags:
      current.error0:  b0    # [b0] .. 8*size / [1] .. 32
      current.error1:  b0/2 
      current.error2:  b1
    
</code>