3.1.4 Transmit Power Levels/Frame Size
The 900 MHz data radios can be operated at 1 watt (30 dBm) or 0.250 watt (24 dBm). For most models, the default transmit
power is 1 watt.
For 2.4 GHz radios, the transmit power is fixed at 0.065 watt (18 dBm) and DIP switch 5 is used to set the frame timing. The
default position (OFF) sets the frame timing to 60 milliseconds. To increase throughput, set the frame timing to 40
milliseconds.
Important: Prior to date code 15341 and radio firmware version 3.6, the frame timing was 40 ms (OFF) or
20 ms (ON).
3.2 Modbus Registers for the MultiHop Radio Board Module
The DX80 MultiHop master radio is a tree-based architecture device that allows for repeater radios to extend the wireless
network. Each device in a MultiHop network is a Modbus device with a unique Modbus ID.
Modbus registers in a MultiHop network are contained within each individual radio device. To obtain Modbus register data
from a MultiHop device, configure the DXM1200 to access each device across the wireless network as an individual
Modbus slave device.
Example: MultiHop Modbus Register Table
Example MultiHop Modbus registers with generic devices.
MulitHop Device
Slave ID
Modbus Registers
DXM Master radio
1
none
Slave radio
11
Modbus register 1–16 are inputs, 501–516 are outputs
Repeater radio
12
Modbus register 1–16 are inputs, 501–516 are outputs
Slave radio
15
Modbus register 1–16 are inputs, 501–516 are outputs
3.3 DIP Switch Settings for the Performance Gateway Radio Module
The 900 MHz radios transmit at 1 Watt (30 dBm) or 250 mW (24 dBm). While the Performance radios operate in 1 Watt
mode, they cannot communicate with the older 150 mW radios. To communicate with 150 mW radios, operate this radio in
250 mW mode. For 2.4 GHz models, this DIP switch is disabled. The transmit power for 2.4 GHz is fixed at about 65 mW
EIRP (18 dBm), making the 2.4 GHz Performance models automatically compatible with older 2.4 GHz models.
DIP Switch Bank D1
DIP Switch 1
OFF *
1 Watt (30 dBm, 900 MHz models only) (default configuration)
ON
250 mW (24 dBm, 900 MHz models only), DX80 compatibility mode
3.4 Modbus Registers for the Performance Gateway Radio Module
The DX80 Performance Gateway is a star-based architecture device that contains all the Modbus registers for the wireless
network within the Gateway. To access any input or output values within the entire wireless network, read the appropriate
Modbus register from Gateway.
There are 16 Modbus registers allocated for each device in the wireless network. The first 16 registers (1–16) are allocated
for the Gateway, the next 16 (17–32) are allocated for Node 1, the next 16 (33–48) are allocated for Node 2 and so forth.
There are no inputs or outputs on the DXM embedded Gateway but the Modbus registers are still allocated for them.
Although only seven Nodes are listed in the table, the Modbus register numbering continues for as many Nodes as are in
the network. For example, the register number for Node 10, I/O point 15 , is 175. Calculate the Modbus register number for
each device using the equation:
Register Number = I/O# + (Node# × 16)
Sure Cross
®
DXM1200-Bx Wireless Controller
18
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