SATEC SA300 ezPAC Operation Manual - Manual (Page 113)

Chapter 10 Configuring Communication Protocols Configuring Modbus
SA300 Substation Automation Unit 113
Chapter 10 Configuring Communication Protocols
This section describes how to customize protocol options for use with your
application software.
Configuring Modbus
Modbus Point Mapping
The SA300 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 SA300 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.
Changing Raw Scales for 16-bit Registers
16-bit analog registers are normally read with scaling to the default range of 0 to
9999. Refer to the SA300 Modbus Reference Guide for more information on scaling
16-bit Modbus registers.