2. System Function 2.3.5.3. Message Format The following is the format of the Modbus packet of CNC program downloaded dynamically. Request message format: Address: The communication node ID of DVP10MC11T, default: 02 Function Code: Function code, 0x7A indicates to download CNC programs dynamically. G-Code String: A complete row of CNC program character string presented in ASCII code value with the symbol of “Enter” in the end. For instance, suppose that the address of DVP10MC11T is 02, the G code character string to be download is N00 G00 X10.0 Y10.0. The request message (Hex) will be 027A4E303020473030205831302E30205931302E300D8E57 Explanation of message: 027A:
Node ID and function code 4E303020: N00 [A blank space] 47303020: G00 [A blank space] 5831302E3020: X10.0 [A blank space] 5931302E300D: Y10.0 [A blank space] 8E57: CRC parity Response message format: Address: The node ID of DVP10MC11T, default: 02. Function Code: Function code, 0x7A indicates to download CNC program dynamically. Response Code: 2-26 DVP-MC operating manual 0 1 2…n-1 n…n+1 Address Function Code 0x7A] G-Code string Parity 0 1 2 3-4 Address Function Code [0x7A] ResposeCode Parity 00 Illegal function code 01 Success 02 In process of transmission 04 Illegal command 05 Time-out 06 Illegal length of the message received 07 Equipment is busy 08 The buffer area receiving data is full