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SE2000 SERIES CONTROLLERS (VERSION4.0)
RS-485 COMMUNICATION INSTRUCTION MANUAL
MODBUS Protocol Reference Guide
1.1 General -----------------------------------------------------------------------------------------1
2.1 Communication Specifications --------------------------------------------------------1
3.1 Terminal Allocation ------------------------------------------------------------------------1
3.2 Wiring ------------------------------------------------------------------------------------------2
4.1 Set Items --------------------------------------------------------------------------------------2
4.2 Setting Operation Method ---------------------------------------------------------------2
5.1 General -----------------------------------------------------------------------------------------3
---------------------------------------------------------------3
5.3 Response of Slave Station --------------------------------------------------------------4
5.4 Function Code -------------------------------------------------------------------------------4
5.5 Calculation of Error Check Code (CRC-16) ----------------------------------------4
5.6 Transmission Control Procedure -----------------------------------------------------5
6.1 Read-out of Word Data [Function Code: 03] ---------------------------------------6
6.2 Read-out of Read-Only Word Data [Function Code: 04] ------------------------6
6.3 Write-in of Word Data (1 word) [Function Code: 06] ----------------------------7
7.1 Data Format ----------------------------------------------------------------------------------7
7.2 Data Address Map --------------------------------------------------------------------------8
8. TROUBLESHOOTING
8.1 Troubleshooting ----------------------------------------------------------------------------8
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Summary of Contents for Gigarise SE2000 SERIES
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Page 1: Table Of Contents
SE2000 SERIES CONTROLLERS (VERSION4.0) RS-485 COMMUNICATION INSTRUCTION MANUAL MODBUS Protocol Reference Guide 1. COMMUNICATION FUNCTIONS 1.1 General -----------------------------------------------------------------------------------------1 2. SPECIFICATIONS 2.1 Communication Specifications --------------------------------------------------------1 3. CONNECTION 3.1 Terminal Allocation ------------------------------------------------------------------------1 3.2 Wiring ------------------------------------------------------------------------------------------2 4. SETTING OF COMMUNICATION CONDITION 4.1 Set Items --------------------------------------------------------------------------------------2 4.2 Setting Operation Method ---------------------------------------------------------------2... -
Page 2: Communication Functions
1. COMMUNICATION FUNCTIONS 1.1 General SE series provides a communication function by RS-485 interface, by which it can transmit and receive data to and from host computer, programmable controller, graphic display panel, etc. The communication system consists of master station and slave stations. Up to 255slave station can be connected per master station. -
Page 3: Wiring
3.2 Wiring Use twisted pair cables with shield. Recommended cable: UL2464, UL2448, etc. The total extension length of the cable is up to 500m. A master station and up to 255 units of the SE series can be connected per line. Both ends of the cable should be connecting with terminate resistors 100 1/2W. -
Page 4: Modbus Communication Protocol
BAUD Press SET key to save “BAUD”. Press SET +▽ one time to return the normal indication SET + ▽ 25/100 (PV/SV indication). 5. MODBUS COMMUNICATION PROTOCOL 5.1 General The communication system by the MODBUS protocol is that the communication is always started from the master station and a slave station responds to the received message. -
Page 5: Response Of Slave Station
Data are the data required for executing function codes. The composition of data varies with function codes. Refer to chapter 6 for details. A data address is assigned to each data in the temperature controller. For reading/writing the data by communication, designate the data address. 5. -
Page 6: Transmission Control Procedure
3. If the LSB is 0: Shift the CRC register one bit to the right (toward the LSB), Zero-filling the MSB. If the LSB is 1: Shift the CRC register one bit to the right (toward the LSB), Zero-filling the MSB. Exclusive OR the CRC registers with the polynomial value A001 hex. -
Page 7: Details Of Message 6.1 Read-Out Of Word Data [Function Code: 03]
carries out-processing with that frame as a command message. If the command message is destined to the own station, a response message is returned. Its processing time is 1 to 10ms (depends on contents of command message). After sending a command message, therefore, the master station must observe the following. -
Page 8: Write-In Of Word Data (1 Word) [Function Code: 06]
Address Function Byte Number Word Data CRC-16 001B F93B 6.3 Write-in of Word Data (1 word) [Function Code: 06] 1. Message composition Command message composition Address Function Starting Address Word Data CRC-16 1 ~ FF 0xxx 0xxx Low-order byte High-order byte 1 byte 1 byte 2 bytes... -
Page 9: Data Address Map
LINE HH.MM 1001 NONE MM.SS 1010 ℃ 2.4K 1011 ℉ 4.8K 1100 HI.LO Data Address Map Word data (read-out/write-in) : Function code [03,,05,06] Data Address Parameter Range Unit 0000 HiLt~LoLt ℃/℉ 0001 SPOF -1000~1000 ℃/℉ 0002 PVOF -1000~1000 ℃/℉ 0003 A1SP -1000~1000 ℃/℉... - Page 10 8.1 Troubleshooting If the communication is unavailable, check the following items. □ Whether all devices related to communication are turned on. □ Whether connections are correct. □ Whether the number of connected instruments and connection distance are as specified. □ Whether communication conditions coincide between the master station (host computer) and slave station (SE6000).
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