ModMaster Manual v3.10 - 1.4.  Setup overview

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1.4.  Setup overview

This section gives an overview of how to set up ModMaster.

The pages used for setup are from Settings group of pages listed on left of the main window. Each page has a Help button, which provides context-sensitive help on the page.

ModMaster provides two ways of sending commands to a Modbus slave:

1.4.1. Setup for sending commands only

If you simply want to send Modbus commands to the slave (i.e. you don't want to use polling or the register read/write buttons) you can set up ModMaster using the following steps:

  • Use the Interface to Slave page (see Interface settings) to configure the interface to the Modbus slave.

  • If the slave uses 32-bit or 64-bit values, configure the handling of these using the 32/64-bit Values page (see 32/64-bit Value Settings).

  • You may also want to configure the Number of Retries and Response Timeout in the General page (see General settings).

  • Click the Run button to open the connection to the Modbus slave.

You may then send individual Modbus commands to the slave using the Define Command page (see Commands).

You may close the connection to the slave by clicking the Run button, and re-open it by clicking the Run button again.

1.4.2. Setup for using defined registers

If you want to use polling or the register read/write buttons, the steps for setting up are a bit more complicated, since you will need to define some registers:

  • In the General page (see General settings), set the Slave ID to the slave identifier that you want ModMaster to send in requests.

  • Use the Interface to Slave page (see Interface settings) to configure the interface to the Modbus slave.

  • If you want to use coils or discrete inputs, or you want to use register addresses that are different from the addresses sent in messages, configure the address mapping using the Address Mapping page (see Address mapping).

  • If the slave uses 32-bit or 64-bit values, configure the handling of these using the 32/64-bit Values page (see 32/64-bit Value Settings).

  • Define the registers that you want to access (see Defining registers).

  • If you want to use polling, you may want to configure how ModMaster polls registers in the Polling page (see Polling Settings).

  • You may also want to configure the Number of Retries and Response Timeout in the General page (see General settings).

  • Click the Run button to open the connection to the Modbus slave.

You may then use polling and the register read/write buttons.

You may close the connection to the slave by clicking the Run button, and re-open it by clicking the Run button again.