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1. Description of RS485 Communication Protocol for SKLC Series Elliptical Gear Flow Meter of SUKO Instruments
Description of RS485 Communication Protocol for SKLC Series Elliptical Gear Flow Meter of SUKO Instruments The RS485 communication protocol for SKLC series elliptical gear flow meter of SUKO Instruments is mainly based on RTU mode, and provides various communication parameters and register addresses for reading and writing data. Here is a detailed explanation of the communication protocol:
1. Communication parameter settings Communication mode: RTU mode Baud rate: default to 9600bps (can be set to 2400, 4800, 9600, or 19200bps) Data bits: 8-bit Check bits: no check (can be set to no check, odd check, or even check) Stop raising and dismantling bits: 1-bit Frame Check field: cyclic redundancy check (CRC), performs check on all message contents
2. Communication frame format Sending frame format: (except for CRC check, all sent words are first high byte and then low byte): Slave address: 1 byte Function code: 1 byte Data: 0 to 252 bytes CRC: 2 Byte (CRC low byte and CRC high byte)
III. Communication parameter configuration register Communication parameters can be configured by writing to specific registers. The specific register addresses and functions are as follows: C00: Instrument communication address, set range 0-255, default value is 1C01: communication baud rate, set values correspond to different baud rates, such as 000 corresponds to 2400bps, 001 corresponds to 4800bps, 002 corresponds to 9600bps (factory value), 003 corresponds to 19200bps sC02: communication mode setting (including protocol and checksum settings), where M bit selects the protocol (M=0 is the new protocol, fact
IV. Data Read and Write Single Accumulation: Address: 40001-40002 (2 registers) Read and Write Properties: RW (readable and writable) Data Format: 32-bit unsigned number, 3 decimal places, Unit: L Total Cumulative High: Address: 40003-40004 (2 registers) Read and Write Properties: R (read-only) Data Format: 32-bit unsigned number, Unit: m ³ Total Cumulative Low: Address: 40005-40006 (2 registers) Read and Write Properties: R (read-only) Data Format: 32-bit unsigned number, 3 decimal places, Unit: L Instantaneous Quantity: Address: 40007-40008 (2 registers) 2 registers) Read and write properties: R (read-only) Data format: 32-bit unsigned number, 3-digit decimal, unit: m ³/h
5. Communication protocol example Protocol 1 (new protocol) Example: Settings: C00=0000001, C01=0000002, C02=0000000 Host query command sent: 01 03 00 00 08 44 0C (query single cumulative, total cumulative high, total cumulative low, and instantaneous quantity) Flow meter response: 01 03 10 00 14 AD 5C 00 BC 61 B2 00 01 3E C0 00 6B 22 21 CF (including data for single cumulative, total cumulative high, total cumulative low, and instantaneous quantity) Protocol 2 Example: Settings: C00=000000 1, C01=00000 2, C02=00000 12 (even check) Host query command sent: 01 03 00 00 0A C5 CD Flow meter response: 01 03 14 00 00 00 02 05 53 14 70 00 00 02 00 C4 D6 A0 00 00 FB D0 34 A2 (including single check) Protocol 3 (Floating Point Protocol) for data with high cumulative count, low cumulative count, high cumulative total count, low cumulative total count, and instantaneous quant