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
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 |
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0 | Phase A line current | 500 counts equals 1 ⋅ CT primary |
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1 | Phase B line current | 500 counts equals 1 ⋅ CT primary |
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2 | Phase C line current | 500 counts equals 1 ⋅ CT primary |
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3 | 500 counts equals 1 ⋅ CT primary | |
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4 | 500 counts equals 1 ⋅ CT primary | |
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5 | 500 counts equals 1 ⋅ CT primary | |
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6 | Ground current | 500 counts equals 1 ⋅ CT primary |
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| or 1A for 50:0.025 |
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7 | Phase A to neutral voltage | 2500 counts equals 120 secondary volts |
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8 | Phase B to neutral voltage | 2500 counts equals 120 secondary volts |
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9 | Phase C to neutral voltage | 2500 counts equals 120 secondary volts |
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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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