Section 3, ModBUS . . . . . . . . . . . . . . . . . . . .3-1
ModBUS Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Table 3-1. Supported ModBUS Function Codes . .3-1
Table 3-2. ModBUS Memory Map Overview . . . . .3-2
ModBUS Base Address (Read/Write) . . . . . . . . . . . . .3-2
Table 3-3. ModBUS Bas Address (Read/Write) . . .3-2
Table 3-4. ModBUS Factory Configuration Data
(Read Only) . . . . . . . . . . . . . . . . . . . . . . . . . .3-3
Table 3-5. ModBUS User Configuration Data
(Read/Write) . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Table 3-6. Alarm Function Codes - Word 1
(Read/Write at Address Base+137) . . . . . . . .3-5
Table 3-7. Alarm Function Codes - Word 2
(Read/Write at Address Base+138) . . . . . . . .3-5
Table 3-8. ModBUS Device Status (Read only) . . .3-6
Table 3-9. ModBUS General Status Bits
(Read Only at address Base+201) . . . . . . . . .3-8
Table 3-10. ModBUS Fault Status Bits
(Read Only at address Base+202) . . . . . . . . .3-8
Table 3-11. Control Words (Read/Write) . . . . . . . .3-9
Table 3-12. ModBUS Command Word 1
(Read at address Base+301/Write Coils
1 through 16) . . . . . . . . . . . . . . . . . . . . . . . . .3-9
Table 13-13 ModBUS Command Word 2
(Read at address Base+302/Write Coils
17 through 32) . . . . . . . . . . . . . . . . . . . . . . .3-10
Table 3-14. Sensor Type . . . . . . . . . . . . . . . . . . .3-10
Table 3-15. Sensor Engineering Units . . . . . . . . .3-11
Table 3-16. Information Flags Word #1 –
(Read at address Base+254) . . . . . . . . . . . .3-12
Table 3-17. Information Flags Word #2
(Read at address Base+255) . . . . . . . . . . . .3-12
Table 3-18. Information Flags Word #3
(Read at address Base+26) . . . . . . . . . . . . .3-13
Table 3-19. Information Flags Word #4
(Read at address Base+257) . . . . . . . . . . . .3-13
Table 3-20. Alternate Gas Readings
(Read/Write at address Base+258
to Base+260) . . . . . . . . . . . . . . . . . . . . . . . .3-14
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