Modbus Instructions
2Configuration (continued)
Modbus Function Set
Function | Sub Function | HEX | Description | ||
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Dec | HEX | Dec | |||
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1 | 01 |
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| Read Coil Status | |
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2 | 02 |
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| Read Input Status | |
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3 | 03 |
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| Read Holding Registers | |
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4 | 04 |
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| Read Input Registers | |
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5 | 05 |
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| Force Single Coil | |
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6 | 06 |
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| Preset Single Register | |
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7 | 07 |
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| Read Exception Status | |
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8 | 08 | 0 | 00 | Diagnostic - Return Query Data | |
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| 1 | 01 | Diagnostic - Restart Communication | |
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| 2 | 02 | Diagnostic - Return Diagnostic Register | |
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| 4 | 04 | Diagnostic - Force Listen Mode | |
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| 10 | 0A | Diagnostic - Clear Counters and Diagnostic | |
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| 11 | 0B | Diagnostic - Return Bus Message Count | |
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| 12 | 0C | Diagnostic - Bus Communication Error Count | |
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| 13 | 0D | Diagnostic - Bus Exception Error Count | |
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| 14 | 0E | Diagnostic - Return Slave Message Count | |
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| 15 | 0F | Diagnostic - Return Communication Error Count | |
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| 16 | 10 | Diagnostic - Return Slave NAK Count | |
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| 17 | 11 | Diagnostic - Return Slave Busy Count | |
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| 18 | 12 | Diagnostic - Return Bus Character Overrun Count | |
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| 20 | 14 | Diagnostic - Clear Overrun Counter and Flag | |
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11 | 0B |
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| Get Communication Event Counter | |
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12 | 0C |
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| Get Communication Event Log | |
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15 | 0F |
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| Write Multiple Coils | |
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16 | 10 |
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| Write Multiple Registers | |
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17 | 11 |
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| Report Slave ID | |
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23 | 17 |
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| Read / Write Multiple Registers | |
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