6. Set the Output Type Select Modbus register (on the I/O board, Slave ID 200) to a value of 2 (default) to select 0 to
20 mA or a value of 3 to select 0 to 10 V. For analog output 1 write to Modbus register 4008, for analog output 2
write to Modbus register 4028 (see the table for the values).
DXM100-B1 and S1 Models
Pin
Analog
Output
Modbus
Register
Description
20
1
507
0 to 20 mA or 0 to 10 V dc output (I/O board jumper selectable)
Accuracy: 0.1% of full scale +0.01% per °C
Resolution: 12-bit
19
2
508
Parameters for Analog Output 1 start at 4001 through 4008. Parameters for Analog Output 2 start at 4021 through 4028.
Parameter Registers for Analog Outputs (4xxxx)
OUT 1
OUT 2
Parameters
4001
4021
Maximum Analog Value
4002
4022
Minimum Analog Value
4003
4023
Enable Register Full Scale
4004
4024
Hold Last State Enable
4005
4025
Default Output State
4008
4028
Analog Output Type
Analog Output Type. The analog outputs may be configured as either 0 to 20 mA outputs (default) or 0 to 10 V outputs.
To change the analog output type change the hardware jumper position and write to the Modbus register that defines the
analog output type. For analog output 1, write to Modbus register 4008, for analog output 2 write to Modbus register
4028. Write a value of 2 (default) to select 0 to 20 mA; write a value of 3 to select 0 to 10 V.
Default Output Conditions. Default output conditions/triggers are the conditions that drive outputs to defined states.
Example default output conditions include when radios are out of sync, when a device cycles power, or during a host
communication timeout.
•
2952 Enable Default Communication Timeout. A “communication timeout" refers to the communication
between any Modbus master host and the DXM baseboard. Set this register to 1 to enable the default condition
when the host has not communicated with the DXM baseboard for the period of time defined by the Communication
Default IO Timeout.
•
2953 Communication Default I/O Timeout (100 ms/Count). This parameter defines the host timeout period
in 100 millisecond increments. If a host does not communicate within this timeout period, the device outputs are
set to the default values.
•
2954 Enable Default on Power Up. Setting this parameter to 1 sends the device outputs to their default
condition when the DXM baseboard is powered up. Set to 0 to disable this feature.
Default Output State. The Default Output State parameter represents the default condition of the analog output. When
an error condition exists, the outputs are set to this 16-bit user-defined output state. To define the error conditions for
device outputs, refer to the MultiHop default output parameters 2950-2954.
Enable Register Full Scale. Set to 1 to enable a linear range from 0 to 65535 for specified input range. For a 4 to 20 mA
output, a value of 0 represents 4 mA and 65535 represents 20 mA. Set this parameter to 0 to store readings in unit-
specific data. For example, the register data representing a 15.53 mA reading is 15530. For units of current (0 to 20 mA
outputs), values are stored as µA (micro Amps) and voltage values are stored as mV (millivolts).
Hold Last State Enable. Set the Hold Last State to 1 to set the output to its last known value before the error occurred.
Set this parameter to 0 to disable the Hold Last State and use the Default Output State setting during an error condition.
Maximum Analog Value. The Maximum Analog Value register stores the maximum allowed analog value. The specific
units of measure apply to the register value. For example, the register may contain 20000, for 20 mA, or for a voltage
output the register may contain 8000, for 8 volts.
Minimum Analog Value. The Minimum Analog Value register stores the minimum allowed analog value. The specific units
of measure apply to register value. For example, the register may contain 4000, for 4 mA, or for a voltage output the
register may contain 2000, for 2 volts.
5.6.4 Modbus I/O Registers for the DXM100-B1 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 DXM Controller to read or write the values on the I/O base board.
DXM100-Bx Wireless Controller Instruction Manual
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