ICP DAS USA I-7530A-MR User Manual

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ICP DAS USA I-7530A-MR User Manual Manual pdf 93 page image

I-7530A-MR Modbus RTU to CAN Converter User’s Manual (Version 1.07, 06/2016) ------------- 93This page is used for configuring “Modbus Read Command” and“Response CAN Message”. The major purpose of the “Modbus ReadCommand” is access Modbus slave device via “Modbus Read Coil” or “ModbusRead Registers” command. And the major purpose of the “Response CANMessage” is used to response CAN message with I/O data which is read fromModbus slave device via “Modbus Read Command”.6.3.1.1 Modbus Read CommandThe “Modbus Read Command” is divided into several parameters.Following, we will illustrate how to configure and operate the “Modbus ReadCommand”. Memory Usage:This field indicates the usage of “Read Memory Space”. As section 6.2description, the total memory size is 2048. The meaning of this field is“current usage / total size”, which unit is byte. Enabled Current Command:This field is used to decide whether the current command is used inoperation mode or not. You can enable or disable this Modbus readcommand after you selected a command from the command list. Modbus Configuration:As we know, the Modbus Read Coil/Registers format is as following.NodeIDFunctionCodeStartAddressStartAddressBit/WordCountBit/WordCountCRC CRCIn order to fit Modbus Read Coil/Registers format, the Modbusconfiguration interface is designed as following:Current Usage Total Size