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CHAPTER 18: MODBUS PROTOCOL MODBUS PROTOCOL
MULTILINK ML2400 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL 18–3
18.2 Memory Mapping
18.2.1 Modbus Memory Map
The Modbus memory map is shown below. Refer to Format Codes on page 18–36 for
details on the items in the format column.
Table 18–1: Modbus memory map (Sheet 1 of 33)
Address Description Range Step Format Default
0000 System name (12 registers) - - String Varies
000C System contact (12 registers) - - String multilin.tech
@ge.com
0018 System location (12 registers) - - String Markham, Ontario
0024 Software version (6 registers) - - String Varies
002A IP address (byte 0) 1 to 254 1 F1 0
002B IP address (byte 1) 1 to 254 1 F1 0
002C IP address (byte 2) 1 to 254 1 F1 0
002D IP address (byte 3) 1 to 254 1 F1 0
002E Netmask (byte 0) 1 to 254 1 F1 0
002F Netmask (byte 1) 1 to 254 1 F1 0
0030 Netmask (byte 2) 1 to 254 1 F1 0
0031 Netmask (byte 3) 1 to 254 1 F1 0
0032 Gateway (byte 0) 1 to 254 1 F1 0
0033 Gateway (byte 1) 1 to 254 1 F1 0
0034 Gateway (byte 2) 1 to 254 1 F1 0
0035 Gateway (byte 3) 1 to 254 1 F1 0
0036 MAC address (3 registers) - - String Varies
0039 Order code (16 registers) - - String Varies
0049 Power alarm 1 0 to 1 1 F2 0
004A Power alarm 2 0 to 1 1 F2 0
004B Stp State 0 to 1 1 F3 0
004C Number of ports 1 to 32 1 F1 Varies
004E Port present map - - Bitmap Varies
0050 Port link map - - Bitmap 0
0052 Port stp state map - - Bitmap 0
0054 Port activity map - - Bitmap 0
0056 Port 1 type 0 to 6 1 F4 Varies
0057 Port 2 type 0 to 6 1 F4 Varies
0058 Port 3 type 0 to 6 1 F4 Varies
0059 Port 4 type 0 to 6 1 F4 Varies
005A Port 5 type 0 to 6 1 F4 Varies
005B Port 6 type 0 to 6 1 F4 Varies
005C Port 7 type 0 to 6 1 F4 Varies
005D Port 8 type 0 to 6 1 F4 Varies
005E Port 9 type 0 to 6 1 F4 Varies
005F Port 10 type 0 to 6 1 F4 Varies
0060 Port 11 type 0 to 6 1 F4 Varies
0061 Port 12 type 0 to 6 1 F4 Varies