Function codes The following "Function Codes" are supported: Function Code Name Function Code Subfunction Code Data Access (16-bit) Read Holding Registers 03h Read Input Register 04h Write Single Register 06h Write Multiple Registers 16h Read/Write Multiple Registers 17h Diagnostic Clear Counters and Diagnostic Register 08h 0Ah Return Bus Message Count 08h 0Bh Return Bus Communication Error Count 08h 0Ch Return Bus Exception Error Count 08h 0Dh Return Server Message Count 08h 0Eh Return Server No Response Count 08h 0Fh Return Server NAK Count 08h 10h Return Server Busy Count 08h 11h Return Bus Character Overrun Count 08h 12h Miscellaneous Encapsulated Interface Transport 2Bh 0Dh Read complete OD start 65h 55h Read complete OD next 65h AAh Read complete array/record start 66h 55h Read complete array/record next 66h AAh
Function codes The following "Function Codes" are supported: Function Code Name Function Code Subfunction Code Data Access (16-bit) Read Holding Registers 03h Read Input Register 04h Write Single Register 06h Write Multiple Registers 16h Read/Write Multiple Registers 17h Diagnostic Clear Counters and Diagnostic Register 08h 0Ah Return Bus Message Count 08h 0Bh Return Bus Communication Error Count 08h 0Ch Return Bus Exception Error Count 08h 0Dh Return Server Message Count 08h 0Eh Return Server No Response Count 08h 0Fh Return Server NAK Count 08h 10h Return Server Busy Count 08h 11h Return Bus Character Overrun Count 08h 12h Miscellaneous Encapsulated Interface Transport 2Bh 0Dh Read complete OD start 65h 55h Read complete OD next 65h AAh Read complete array/record start 66h 55h Read complete array/record next 66h AAh
