GE 369-A200 relay

This parameter defines if and how the order of bytes in data received or sent is to be rearranged. This option exists to allow for the fact that different manufacturers store and transmit multi-byte data in different combinations. This parameter is helpful when dealing with floating-point or other multi-byte values, as there is no one standard method of storing these data types. The parameter can be set to rearrange the byte order of data received or sent into an order more useful or convenient for other applications. The following table defines the valid Swap Code values and the effect they have on the byte-order of the data.These swap operations affect 4-byte (or 2-word) groups of data. Therefore, data swapping using these Swap Codes should be done only when using an even number of words, such as when 32-bit integer or floating-point data is involved.

Service Port 

502 or other port numbers supported on a server This field selects the TCP service port on the server to connect. If the parameter is set to 502, a standard MBAP message will be generated. All other service port values will generate a Modbus command message encapsulated in a TCP/IP packet. Slave Address 0 - Broadcast to all nodes 1 to 255 Use this parameter to specify the slave address of a remote Modbus Serial device through a Modbus Ethernet to Serial converter.

Note

 Use the Node IP Address parameter to address commands to a remote Modbus TCP/IP device. See Node IP Address (page 30). Note: Most Modbus devices accept an address in the range of only 1 to 247, so check with the slave device manufacturer to see if a particular slave can use addresses 248 to 255. If the value is set to zero, the command will be a broadcast message on the network. The Modbus protocol permits broadcast commands for write operations. Do not use node address 0 for read operations.

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