M880 VT Primary Voltage
Read or Set the VT Primary Voltage.

The nominal input of the M880 is 280V and the default setting (Primary to Secondary voltage ratio) is 280:280 which implies that there is no VT in circuit.
If a VT is introduced the ratio must be programmed into the meter using primary and secondary voltages to enable the unit to calculate real values.
Values of Secondary Voltage other than 280V will result in a more limited range and impact on the resolution of the meter.

Example
If the rated system voltage is 11000V and the VT ratio used is 11000:220 (50:1), the NOMINAL system voltage (M880 internal 100%) is 280/220*11000 = 14000V.

Sample Coding
Slave Address = 1
Writing To 4X Registers - code 16 (10 hex)
Value to write = 11000

Message Packet To SLAVE
01 10 00 1C 00 02 04 46 2B E0 00 DE 76
N.B. Value 46 2B E0 00 = 11000

Response Packet From SLAVE
01 10 00 1C 00 02 80 OE