Cotek AD-1500 - Table of Contents

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Table of Content

1. AD MODBUS

1-1. Overview……………………………………………………..……….……..1

1-2. Modbus protocol……………………………………………………...…….2

1-3. Modbus Physical Communication…………………………………..……2

1-4. Modbus Message RTU Framing……………………………………..…...3

1-5. Modbus Register……………………………………………………..…….4

1-6. Modbus Function Code Read Coils Registers (0x01)…………..……...4

1-7. Read Coils Registers……………………………………………………...5

1-8. Modbus Function Code Read Holding Registers (0x03)………………5

1-9. Read Holding Registers…………………………………………………...7

1-10. Modbus Function Code Read Input Registers (0x04)…………….…..9

1-11. Read Input Register (R)…………………………………………………10

1-12. Modbus Function Code Write Coils Registers (0x05)………….…….15

1-13. Modbus Function Code Write Single Registers (0x06)………….…...17

1-14. Write Single Register…………………………………………………....18

2. AD PMBUS

2-1. Overview…………………………………………………………………...21

2-2. Wiring / connection of communication system…………………………21

2-3. PMBUS Addressing……………………………………………………….21

2-4. PMBUS Clock Speed……………………………………………………..21

2-5. PMBus Data Format………………………………………………………22

2-6. Supported PMBus Commands…………………………………………..23