Configuration Registers for SDI-12 Device A
Register Enable
Decimal Point
Move
Move Right or Left
Signed or Un-
signed
16 or 32 bit
Register 1
11011
11012
11013
11014
11015
Register 2
11021
11022
11023
11024
11025
Register 3
11031
11032
11033
11034
11035
Register 4
11041
11042
11043
11044
11045
Register 5
11051
11052
11053
11054
11055
Register 6
11061
11062
11063
11064
11065
Register 7
11071
11072
11073
11074
11075
Register 8
11081
11082
11083
11084
11085
Register 9
11091
11092
11093
11094
11095
11xx1 Register Enable. Use this register or enable (1) or disable (0) each register.
11xx2 Decimal Point Move. Enter a value from 0 to 7 to indicate the number of places to move the decimal point to convert from the
SDI-12 value to an integer.
11xx3 Move Right or Left. Write a 0 to move the decimal point to the right; write a 1 to move the decimal point to the left.
11xx4 Signed or Unsigned. Write a 1 for a signed value; write a 0 for an unsigned value.
11xx5 16-bit or 32-bit Registers. Write a 0 for a 16-bit value; write a 1 for a 32-bit value.
Configuration Examples
Configuring an Analog IN to use SP3
Example 1: Enable the first analog input to power an external sensor using switched power 3 and change the parameters based on the
requirements of the external sensor.
This data radio model has analog 1 associated to input 5.
The parameters to adjust and their Modbus registers are:
• Sample interval (reg 1202 hi word, 1203 low word): Change from factory default of 1 second to 15 minute sample interval
• Switch Power Enable (reg 1204): Turn on switch power 3 for this input, using the bit mask
• Switch Power Warm-up (reg 1205): Based on the sensor requirements, turn on the switched power for a certain time before it is
sampled.
• Switch Power Voltage (reg 1206): Set the voltage for the sensor operation.
The values to set in the registers are:
• Sample Interval: 15 min, (900 seconds)
• Switch Power Enable: 0x4
• Switched Power Warm-up: 1 second
• Switched Power Voltage: 15 Volts
Set the following registers to the values shown.
Modbus Register
Value
Description
1202
0
MultiHop Radio Product Manual
34
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151317 Rev 0
