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5 Additional Information
5.1 Adjusting the Receive Slots and Retry Count Parameters
The number of receive slots governs how often a MultiHop device can communicate on the wireless network.
Battery-powered devices typically have DIP switches that allow the user to set the number of receive slots, which directly
affects the battery life of the radio. Adjusting the receive slots changes how often a message can be received. By default, the
receive slots are set to 4 (every 1.3 seconds). When the receive slots are set to 32, the radio listens for an incoming
message every 0.16 seconds.
Users may also leave the retry mechanism to the application that is accessing the wireless network, in this case the
DXM100. Adjust the number of retries in the MultiHop devices by writing the number of retries desired to Modbus register
6012. The factory default setting is 8.
5.2 Modbus Register Summary
5.2.1 Modbus I/O Registers for the DXM100-S1x I/O Base Board
The I/O base board stores the input and output values in Modbus holding registers. Since the I/O base board is defined as a
separate device, configure the DXM100 to read or write the values on the I/O base board.
Base Board Input Connection
Modbus Register
Range
Description
1
0–65535
Universal input 1
2
0–65535
Universal input 2
3
0–65535
Universal input 3
4
0–65535
Universal input 4
Universal Input Register Ranges
Register Types
Unit
Minimum Value
Maximum Value
Discrete input/output
0
1
Universal input 0 to 10 V
mV
0
10000 *
Universal input 0 to 20 mA
µA
0
20000 *
Universal input temperature (–40 °C to +85 °C)
C or F, signed, in tenths of a degree
–400
850
Universal potentiometer
unsigned
0
65535
* Setting Enable Full Scale to 1 sets the ranges to a linear scale of 0 to 65535.
Base Board Output Connection
Modbus Register
Range
Description
501
0–1
NMOS Output 1
502
0–1
NMOS Output 2
503
0–1
NMOS Output 3
504
0–1
NMOS Output 4
505
0–1
Switched Power 1 (5 V or 16 V)
506
0–1
Switched Power 2 (5 V or 16 V)
507
0–20000
Analog Output 1 default (0-20.000 mA)
0–10000
Analog Output 1 (0-10.000 V)
508
0–20000
Analog Output 2 default (0-20.000 mA)
0–10000
Analog Output 2 (0-10.000 V)
Sure Cross
®
DXM100-Sx Wireless Modbus Slave
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