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The following list displays the default data types for each block of SIM_2251
registers:
1000 – 2999 Boolean
3000 – 4999 Integer
5000 – 6900 Long
7000 – 8999 Float
Note
To ensure the best data type assignments, review a GC Config Report.
8. Click Transmit to retrieve the selected registers (i.e., the specified data addresses)
from the GC.
The transmitted/received packet data displays in the Packet Input-Output window.
9. Click Stop to end the transmission of the data and to return to the Modbus
Function Selection options.
7.1.5 Transmit data using a template
Templates are best used when decoding mixed data types because the template contains
data that the Modbus program can use to determine which data type should be assigned
to which register.
To create a new template or to use an existing template, do the following:
Note
To learn the variable names that are assigned to the Modbus registers before retrieving data,
generate a GC Config Report and review the Communication section.
1. In the Slave Addr field, type the COM ID of the GC.
The Modbus program will accept a slave address value of 1 to 247.
To use Broadcast Mode, which directs the Modbus program to poll all known
devices, enter 0 in the Slave Addr field. Each device interprets this poll attempt as an
instruction to read and take action; however, a response message may not be
received by the Modbus program.
Note
Changes are applied to the corresponding register value at each device.
2. Select the desired read or write option from the Function pull down menu.
Function Code Description Broadcast
1 (Read Coil) Reads one or more coil values.
2 (Read Input Status) Reads one or more input status values.
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