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README update.

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parallelbgls
2017-06-30 11:43:19 +08:00
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Modbus.Net/Modbus.Net.Modbus/README.md
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@@ -4,77 +4,4 @@ Modbus.Net.Modbus
Modbus Implementation of Modbus.Net
Table of Content:
* [Basic Concept](#basic)
* [Address Mapping](#address)
* [Addres Coding](#coding)
* [SubAddress Rules](#subpos)
## <a name="basic"></a> Basic Concept
Modbus is a serial communications protocol originally published by Modicon (now Schneider Electric) in 1979 for use with its programmable logic controllers (PLCs). Simple and robust, it has since become a de facto standard communication protocol, and it is now a commonly available means of connecting industrial electronic devices.(From Wekipedia)
## <a name="address"></a> Address Mapping
Modbus has four types of address: Coil, Discrete Input, Input Register and Holding Register.
Modbus has two address description method: standard and extend.
The following table could show the full address discription in Modbus.
Type | Standard | Extend |
---------------- | ----------- | ------------- |
Coil | 00001-09999 | 000001-065536 |
Discrete Input | 10001-19999 | 100001-165536 |
Input Register | 30001-39999 | 300001-365536 |
Holding Register | 40001-49999 | 400001-465536 |
Standard and Extend address description are all supported in Modbus.Net.Modbus. The only difference is don't write too large number in address.
The following table shows how to write address in Modbus.Net.Modbus
Standard Modbus Address | Modbus.Net.Modbus String Address |
----------------------- | -------------------------------- |
00001 | 0X 1 |
00002 | 0X 2 |
09999 | 0X 9999 |
065536 | 0X 65536 |
10001 | 1X 1 |
30001 | 3X 1 |
40001 | 4X 1 |
## <a name="coding"></a> Address Coding
In Modbus.Net, you can write "0X"(Coil), "1X"(Discrete Input), "3X"(Input Register), "4X"(Holding Register) in Area.
Don't forget to type a space between Area and Address.
If you want to use subpos, type string address like this:
4X 1.12 (Area Address.Subpos)
## <a name="subpos"></a> SubAddress Rules
For 0X and 1X, the scalation is 1/8. This means each address is bool.
Noticing that you can only read 1X.
SubAddress System is not activated in 0X and 1X.
For 3X and 4X, the scalation is 2. This meas each address is short.
The number of SubAddress is from 0 to 15.
Caution: Modbus.Net.Modbus SubAddress has a giant difference towards standard Modbus.
Bit position from Modbus.Net is one less than standard modbus.
Standard Modbus
1 0 1 1 1 0 0 0 1 0 0 0 0 1 1 0 <br>
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Modbus.Net.Modbus
1 0 1 1 1 0 0 0 1 0 0 0 0 1 1 0 <br>
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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