Wireshark · Display Filter Reference: Modbus

Field name	Description	Type	Versions
modbus.and_mask	AND mask	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.bit_cnt	Bit Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.bitnum	Bit Number	Unsigned integer (16 bits)	2.4.0 to 4.4.2
modbus.bitval	Bit Value	Boolean	2.4.0 to 4.4.2
modbus.byte_cnt	Byte Count	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.byte_cnt_16	Byte Count (16-bit)	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.conformity_level	Conformity Level	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.data	Data	Byte sequence	1.10.0 to 4.4.2
modbus.data.decode	Invalid decoding options, register data not a multiple of 4!	Label	1.12.0 to 4.4.2
modbus.diagnostic.ascii_input_delimiter	CHAR	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.diagnostic.bus_char_overrun_count	Slave Character Overrun Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.diagnostic.bus_comm_error_count	CRC Error Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.diagnostic.bus_exception_error_count	Exception Error Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.diagnostic.bus_message_count	Total Message Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.diagnostic.clear_ctr_diag_reg	Clear Counters & Diag Register Echo	Unsigned integer (16 bits)	2.0.0 to 4.4.2
modbus.diagnostic.no_slave_response_count	Slave No Response Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.diagnostic.restart_communication_option	Restart Communication Option	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.diagnostic.return_diag_register	Diagnostic Register Contents	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.diagnostic.return_query_data.echo	Echo Data	Byte sequence	1.10.0 to 4.4.2
modbus.diagnostic.return_query_data.request	Request Data	Byte sequence	1.10.0 to 4.4.2
modbus.diagnostic.slave_busy_count	Slave Device Busy Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.diagnostic.slave_message_count	Slave Message Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.diagnostic.slave_nak_count	Slave NAK Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.diagnostic_code	Diagnostic Code	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.ev_count	Event Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.ev_msg_count	Message Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.ev_recv_broadcast	Broadcast Received	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.ev_recv_char_over	Character Overrun	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.ev_recv_comm_err	Communication Error	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.ev_recv_lo_mode	Currently in Listen Only Mode	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.ev_send_lo_mode	Currently in Listen Only Mode	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.ev_send_read_ex	Read Exception Sent	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.ev_send_slave_abort_ex	Slave Abort Exception Sent	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.ev_send_slave_busy_ex	Slave Busy Exception Sent	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.ev_send_slave_nak_ex	Slave Program NAK Exception Sent	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.ev_send_write_timeout	Write Timeout Error Occurred	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.ev_status	Status	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.event	Event	Unsigned integer (8 bits)	2.0.0 to 4.4.2
modbus.exception_code	Exception Code	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.func_code	Function Code	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.mei	MEI type	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.more_follows	More Follows	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.next_object_id	Next Object ID	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.num_objects	Number of Objects	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.object_id	Object ID	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.object_str_value	Object String Value	Character string	1.10.0 to 4.4.2
modbus.object_value	Object Value	Byte sequence	2.0.0 to 4.4.2
modbus.objects_len	Object length	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.or_mask	OR mask	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.padding	Padding	Unsigned integer (8 bits)	2.0.0 to 4.4.2
modbus.read_device_id	Read Device ID	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.read_reference_num	Read Reference Number	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.read_word_cnt	Read Word Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.reference_num	Reference Number	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.reference_num_32	Reference Number (32 bit)	Unsigned integer (32 bits)	1.10.0 to 4.4.2
modbus.reference_type	Reference Type	Unsigned integer (8 bits)	1.10.0 to 4.4.2
modbus.reg16	Register Value (16-bit)	Unsigned integer (16 bits)	2.0.0 to 2.2.17
modbus.reg32	Register Value (32-bit)	Unsigned integer (32 bits)	2.0.0 to 2.2.17
modbus.register.ieee_float	Register (IEEE Float)	Floating point (single-precision)	1.10.0 to 1.12.13
modbus.register.modicon_float	Register (Modicon Float)	Floating point (single-precision)	1.10.0 to 1.12.13
modbus.register.uint16	Register (UINT16)	Unsigned integer (16 bits)	1.10.0 to 1.12.13
modbus.register.uint32	Register (UINT32)	Unsigned integer (32 bits)	1.10.0 to 1.12.13
modbus.regnum16	Register Number	Unsigned integer (16 bits)	2.4.0 to 4.4.2
modbus.regnum32	Register Number	Unsigned integer (32 bits)	2.4.0 to 4.4.2
modbus.regval_float	Register Value (IEEE Float)	Floating point (single-precision)	2.4.0 to 4.4.2
modbus.regval_int16	Register Value (INT16)	Signed integer (16 bits)	2.4.0 to 4.4.2
modbus.regval_int32	Register Value (INT32)	Signed integer (32 bits)	2.4.0 to 4.4.2
modbus.regval_uint16	Register Value (UINT16)	Unsigned integer (16 bits)	2.4.0 to 4.4.2
modbus.regval_uint32	Register Value (UINT32)	Unsigned integer (32 bits)	2.4.0 to 4.4.2
modbus.request_frame	Request Frame	Frame number	2.0.0 to 4.4.2
modbus.response_time	Time from request	Time offset	3.0.0 to 4.4.2
modbus.word_cnt	Word Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.write_reference_num	Write Reference Number	Unsigned integer (16 bits)	1.10.0 to 4.4.2
modbus.write_word_cnt	Write Word Count	Unsigned integer (16 bits)	1.10.0 to 4.4.2