Modbus Communications, Command Types

11.2.0Slave Port Functionality

11.2.1Modbus Communications

The T-3 Modbus Slave card runs the RTU version of the Modbus protocol. This capability allows the module to communicate data from a Raypak B6000 Boiler Control to a Modbus Master host, and vice-versa. The module supports both point-to-point implementation as well as multi-drop implementations.

The following discusses the functional capabilities of the T-3 card.

11.2.1.1Command/Reply Cycle

Successful communications between the card and a host will always con- sist of the following two transactions:

Command: Message from master giving instruction to slave.

Reply: Response to command.

A slave station will respond to a master issued command in several ways.

Data Message: If the command was executed by the T-3 board, the re- sponse message will include the data requested, or an acknowledge- ment that the command was executed.

Error Message: If the command could not be executed by the T-3 board, for whatever reason, an error response message is transmitted to the master. The error response message consists of the original function code (ORed with 80hex) and error code.

No Reply: If the master does not detect a reply within its time-out pe- riod, the master should retransmit the command, before a time out error is issued. If the Slave could not decode the message or an error occurred preventing the Slave from recognizing the message, no response will be issued.

11.2.1.2Command Types

The T-3 can respond to three types of commands from the master;

read data, write data, and a diagnostic command. These are overviewed below:

Read Data:	The following type of data read commands are supported:
2	Read Input Status
3	Read Multiple Registers
4	Read Input Registers
Write Data:	The Following data write command is supported:
6	Single Register Write
Diagnostics:	The diagnostic command is supported:

8Loopback test - Code 0

11.2.1.3Command Error Checking

When the T-3 cannot execute a command, an error code is generated and returned to the master. Error codes generated at the slave will usually be indicative of an illegal function, an illegal address, bad data, or the inability to complete a transaction because of a network problem.

B6000 specifications

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