MODBUS_BUS SERIAL MODBUS_TYPE MODBUS_TYPE_MASTER MODBUS_SERIAL_TYPE MODBUS_RTU MODBUS_SERIAL_INT_SOURCE MODBUS_INT_EXT MODBUS_SERIAL_RX_BUFFER_SIZE 64 MODBUS_SERIAL_BAUD 9600 MODBUS_REMOTE_ADDRESS 1 MODBUS_SERIAL_RX_ENABLE PIN_C6 //pino RE RS-485 MODBUS_SERIAL_ENABLE_PIN PIN_C7 //pino DE RS-485 Thank you! Update: I created a variable type int and said that it would equal the read value of the register, then that variable would be displayed on the LCD display, but I always get the value 12, does anyone know what I am doing wrong? CCS Code: Code: //Master #include #device *=16 #fuses HS, NOWDT, NOLVP, NOBROWNOUT, NOPROTECT, PUT #use delay(clock=20M) So, if I just want to read the frequency value for example, I convert 0005 (frequency parameter) to hexadecimal and it stays: modbus_read_holding_registers (0x01,0x05,0x01) //read the slave retention registers at address 1 read register 5 and only 1 register But I'm not sure how to display the reading result on the display, could anyone please help me? Any missing detail I answer.

I know to read some register I should use the command from function 3: modbus_read_holding_registers (address of the slave, address of the initial registrar, number of registers to read) Function 3 is used to read the retention registers. The CFW500 uses parameters, each parameter corresponds to a register that stores some data, for example: P0003 = motor current P0005 = motor frequency P0100 = motor acceleration time P0101 = motor deceleration time. I've already started programming in CCS, I'm using just two libraries, the standard CCS LCD library and the MODBUS library. I need to display the value of (a): Motor Current Motor Frequency Motor Acceleration Time Motor Deceleration Time. The crystal of the microcontroller will be 20MHz. I will use a MAX485 transceiver (although the model of the diagram is the MAX487) for the communication medium. I'll attach a diagram of how the physical part will look. I'm programming in C language and using the PIC C Compiler (CCS). I need the PIC18F4550 to read some Variable Speed Drive holding registers. Hi! I'm developing a project in which I have two devices: 1. Message (Help Me!) MODBUS RTU RS-485 Master-Slave Posted: Mon 6:40 pm View previous topic :: View next topic Author José Aparecido (Help Me!) MODBUS RTU RS-485 Master-Slave Goto page 1, 2 NextĬCS Forum Index -> General CCS C Discussion Please do not post bug Reports on this forum. CCS does not monitor this forum on a regular basis.

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