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18–36 MULTILINK ML2400 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL
MODBUS PROTOCOL CHAPTER 18: MODBUS PROTOCOL
18.2.2 Format Codes
• Bitmap: 32-bit group of bits, packed into two registers. Encoded in big endian.
• F1: 16-bit unsigned integer
• F2: Enumeration - power alarm
0 = power supply good
1 = power supply fail
• F3: Enumeration - OFF/ON
0 = Off
1 = On
• F4: Enumeration: port type
0 = Giga - GBIC
1 = Copper - TP
2 = Fiber - 10
3 = Fiber - 100
4 = Giga - 10/100/1000 (triple speed)
5 = Giga - Copper 1000 TP
6 = Giga - SFP
• F9: 32-bit unsigned long
• String: A sequence of octets, packed 2 to one register in sequence.