Configuring Communication Protocols; Configuring Modbus - Satec Expertmeter EM720 Operation Manual

Chapter 5 Configuring the EM720

Configuring Communication Protocols

Configuring Modbus

Modbus Point Mapping
EM720 Power Quality and Revenue Meter
This section describes how to customize protocol options
for use with your application software.
The EM720 provides 120 user assignable registers in the
address range of 0 to 119. You can re-map any register
available in the device to any assignable register so that
Modbus registers that reside at different locations may be
simply accessed using a single request by re-mapping
them to adjacent addresses.
Initially these registers are reserved and none of them
points to an actual data register.
To build your own Modbus register map:
1. From the Meter Setup menu select Protocol Setup
and click on the Modbus Registers tab.
2. Click on the Default button to cause the assignable
registers to reference the actual default device
register 11776 (0 through 119 are not allowable
register addresses for re-mapping).
3. Type in the actual addresses you want to read from
or write to via the assignable registers. Refer to the
EM720 Modbus Reference Guide for a list of the
available registers. Note that 32-bit Modbus
registers should always start at an even register
address.
4. Click Send to download your setup to the device.
Configuring Communication Protocols
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