GE 1601-0149-A2 manual Waveform Capture Dual Setpoints Passcode Operation

489

Communications Guide

Modbus Memory Map

Waveform Capture

Dual Setpoints

Passcode Operation

Each communications port can individually select the ID number of the event of interest by writing address 3003h. This way the front port, rear port and auxiliary port can read different events from the event recorder simultaneously.

The 489 stores up to 64 cycles of A/D samples in a waveform capture buffer each time a trip occurs. The waveform capture buffer is time and date stamped and may therefore be correlated to a trip in the event record. To access the waveform capture memory, select the channel of interest by writing the number to the Waveform Capture Channel Selector (30F5h). Then read the waveform capture data from address 3100h-31BFh, and read the date, time and line frequency from addresses 30F0h-30F4h.

Each communications port can individually select a Waveform Channel Selector of interest by writing address 30F5h. This way the front port, rear port and auxiliary port can read different Waveform Channels simultaneously.

The channel selector must be one of the following values:

VALUE	SELECTED A/D SAMPLES	SCALE FACTOR
0	Phase A line current	500 counts equals 1 ⋅ CT primary
1	Phase B line current	500 counts equals 1 ⋅ CT primary
2	Phase C line current	500 counts equals 1 ⋅ CT primary
3	Neutral-End phase A current	500 counts equals 1 ⋅ CT primary
4	Neutral-End phase B current	500 counts equals 1 ⋅ CT primary
5	Neutral-End phase C current	500 counts equals 1 ⋅ CT primary
6	Ground current	500 counts equals 1 ⋅ CT primary
		or 1A for 50:0.025
7	Phase A to neutral voltage	2500 counts equals 120 secondary volts
8	Phase B to neutral voltage	2500 counts equals 120 secondary volts
9	Phase C to neutral voltage	2500 counts equals 120 secondary volts

Each communications port can individually select an Edit Setpoint Group of interest by writing address 1342h. This way the front port, rear port and auxiliary port can read and alter different setpoints simultaneously.

Each communications port can individually set the Passcode Access by writing address 88h with the correct Passcode. This way the front port, rear port and auxiliary port have individual access to the setpoints. Reading address 0203h, COMMUNICATIONS SETPOINT ACCESS register, provides the user with the current state of access for the given port. A value of 1 read from this register indicates that the user has full access rights to changing setpoints from the given port.

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