CHAPTER 18: MODBUS PROTOCOL
MEMORY MAPPING
MULTILINK ML810 MANAGED EDGE SWITCH – INSTRUCTION MANUAL
18–37
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.