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Ethernet
RS232/CAN
RS-485 (master)
RS-485 (slave)
USB
Local Registers
(Modbus ID 199)
Processor/Outputs (Base Board)
Outputs (Modbus ID 203)
Processor Controlled
Modbus Data Traffic
Control
Cellular Modem
Outputs
Local Registers
Non-Volatile
Local Registers
Float
Local Registers
Integer
ISM Radio (Modbus ID 1)
User Display (Modbus ID 201)
Gateway or MultiHop
LED / LCD Display
Figure 4. DXM700 Modbus overview
1.3.1 DXM Modbus Registers
The DXM700-Bx Wireless Controller may have up to four internal Modbus slave devices:
DXM Internal Modbus Slave IDs (factory default)
Modbus Slave ID
Device
1
DX80 Performance Gateway or MultiHop ISM Radio—MultiHop wireless devices connected to the internal MultiHop radio
should be assigned Modbus Slave addresses starting at 11.
199
Local Registers—Internal storage registers of the DXM700
203
Base Board Outputs—Outputs of the DXM700.
201
LCD Board—The user has access to the LED indicators on the DXM700.
All Modbus registers are defined as 16-bit Modbus Holding Registers. When connecting external Modbus slave devices,
only use Modbus slave IDs 2 through 198. The local registers, the I/O base, and the LCD slave IDs are fixed, but the internal
radio slave ID can be changed if needed.
Modbus Registers for Internal Local Registers (Modbus Slave ID 199)
Local Registers
Type
Description
1–845
32-bit integer
Local data registers
846–849
32-bit integer
Reset, Constant, Timer
851–900
32-bit non-volatile integer
Data flash, non-volatile
901–1000
Reserved for internal use
1001–5000
Floating point
Floating point registers, local data registers
5001–7000
32-bit integer
Same as 1–845
7001–8000
32-bit non-volatile integer
Same as 851–900
> 10000
Read only virtual registers, system-level data
Sure Cross
®
DXM700-Bx Wireless Controller
8
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