Have a look at the offering from Colway Solutions http://www.colwaysolutions.com. They have a unique licensing scheme where you pay for each Modbus function code that you desire to use. Its not free but the pricing seems to be low. I also saw a few ports of the library to some popular microcontrollers and RTOS.
AdvancedHMI has a drivers package included that's just great for almost anything comms, though it may be a bit heavy if all you want is Modbus. AdvancedHMI is also under active development and has a strong user base. http://sourceforge.net/projects/advancedhmi/
NModbus seems to be the most likely to have continued development and there are lots of example projects scattered over the internet. https://code.google.com/p/nmodbus/
Modbus is a very simple protocol to implement. All information you need can easily be found for free on the Internet.
If you choose to implement it yourself, I will be happy to answer any questions you have along the way.
If you choose to go for a modbus master library I would look for:
Modbus TCP support.
Modbus RTU over TCP/UDP and COM-port.
Configurable byte swapping, word swapping
Configurable "base" address so you can choose address 1 to actually be address 0 (sounds stupid, but I prefer to always specify addresses the same way they are documented)
it must support reading several addresses as a block, but it need to be flexible, some modbus slaves will return error if any address in the block is unused/reserved).
I have done a lot of communication with devices for the past few years, since I work for a home automation company, but we don't use Modbus. We do communication in a standard and open way using Web Services for Devices(WSD) which is also know as Devices Profile for Web Services(DPWS).
During this time at one point, I did hear of a project called NModbus. It is an open source library for working with modbus. I have not used it, but looking at the site and the changesets on Google Code, it looks pretty active. You may want to give it a look and even get involved in. This is the only library that I have heard of that targets .Net.
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查看 Colway Solutions http://www.colwaysolutions.com 提供的产品。 他们有一个独特的许可方案，您可以为您想要使用的每个 Modbus 功能代码付费。 它不是免费的，但定价似乎很低。 我还看到了该库对一些流行的微控制器和 RTOS 的一些移植。
Have a look at the offering from Colway Solutions http://www.colwaysolutions.com. They have a unique licensing scheme where you pay for each Modbus function code that you desire to use. Its not free but the pricing seems to be low. I also saw a few ports of the library to some popular microcontrollers and RTOS.
FieldTalk Modbus 库 - 处理所有 Modbus 功能
FieldTalk Modbus Library - handles all Modbus functions
AdvancedHMI 包含一个驱动程序包，几乎适用于所有通信，但如果您只需要 Modbus，它可能会有点重。 AdvancedHMI 也正在积极开发中，并拥有强大的用户基础。
http://sourceforge.net/projects/advancedhmi/
NModbus 似乎最有可能继续开发，并且互联网上散布着许多示例项目。
https://code.google.com/p/nmodbus/
我喜欢使用这个过去（通过 TCP 的 Modbus）：
http://www.codeproject.com/Tips/16260/Modbus-TCP-class
Modbus 与西门子徽标 PLC 略有不同。 我有一个示例项目，可以根据要求发送。
AdvancedHMI has a drivers package included that's just great for almost anything comms, though it may be a bit heavy if all you want is Modbus. AdvancedHMI is also under active development and has a strong user base.
http://sourceforge.net/projects/advancedhmi/
NModbus seems to be the most likely to have continued development and there are lots of example projects scattered over the internet.
https://code.google.com/p/nmodbus/
I have liked using this one in the past (Modbus via TCP):
http://www.codeproject.com/Tips/16260/Modbus-TCP-class
Modbus to a Siemens Logo PLC is a little different. I have an example project I could send upon request.
Modbus 是一个实现起来非常简单的协议。 您需要的所有信息都可以在互联网上轻松免费找到。
如果您选择自己实施，我将很乐意回答您在此过程中遇到的任何问题。
如果您选择使用 Modbus 主库，我会寻找：
Modbus is a very simple protocol to implement. All information you need can easily be found for free on the Internet.
If you choose to implement it yourself, I will be happy to answer any questions you have along the way.
If you choose to go for a modbus master library I would look for:
自从我在一家家庭自动化公司工作以来，过去几年我与设备进行了大量通信，但我们不使用 Modbus。 我们使用设备 Web 服务 (WSD) 以标准且开放的方式进行通信，该服务也称为设备配置文件Web 服务（DPWS）。
在此期间，我确实听说过一个名为 NModbus 的项目。 它是一个用于使用 modbus 的开源库。 我没有使用过它，但查看了该网站以及 Google 代码上的变更集 ，看起来很活跃。 您可能想看一下甚至参与其中。这是我听说过的唯一一个针对 .Net 的库。
I have done a lot of communication with devices for the past few years, since I work for a home automation company, but we don't use Modbus. We do communication in a standard and open way using Web Services for Devices(WSD) which is also know as Devices Profile for Web Services(DPWS).
During this time at one point, I did hear of a project called NModbus. It is an open source library for working with modbus. I have not used it, but looking at the site and the changesets on Google Code, it looks pretty active. You may want to give it a look and even get involved in. This is the only library that I have heard of that targets .Net.