APPENDIX B: MODBUS PROTOCOL B.4 MODBUS DATA
GEK-106310-AF F650 DIGITAL BAY CONTROLLER B-9
If during this process there is an error response, the request can be repeated in address 0xff02 reading 246 bytes (2
bytes that indicate the number of bytes sent, and 244 data bytes).
Each Snapshot event includes:
1
st
byte: event format code.
N bytes: Event information structured depending on the code
There is only one format type with code 0. Its structure is as follows:
• UINT16: event handle.
• 8 bytes: event date and time.
• 29 bytes: event cause. (string end in null).
• UINT32: Phasor Ia (scaled to 1000).
• UINT32: Phasor Ib (scaled to 1000).
• UINT32: Phasor Ic (scaled to 1000).
• UINT32: Line Frequency (scaled t
o 1000).
• UINT32: Phasor Ig (scaled to 1000).
• UINT32: Phasor Isg (scaled to 1000).
• UINT32: Zero seq I0 (scaled to 1000).
• UINT32: Positive seq
I1 (scaled to 1000).
• UINT32: Negative seq I2 (scaled to 1000).
• UINT32: Phasor Van (scaled to 1000).
• UINT32: Phasor Vbn (scaled to 1000).
• UINT32: Phasor Vcn (scaled to 1000).
• UINT32: Positive Seq V1 (scaled to 1000).
• UINT32: Negative Seq V2 (scaled to 1000).
• UINT32: Zero Seq V0 (scaled to 1000).
• UINT32: 3 Phase Power Factor (scaled to 1000).
Example:
1
st
step:
[0xFE 0x10 0xFE 0x00 0x00 0x06 0x0C 0x4E 0x45 0x57 0x5F 0x45 0x56 0x45 0x2E 0x54 0x58 0x54 0x00 0x16 0xB0] -------
-> RELAY
PC <--------- [0xFE 0x10 0xFE 0x00 0x00 0x06 0x65 0xEC]
2
nd
step:
[0xFE 0x03 0xFF 0x00 0x00 0x7D 0xA1 0xF0] --------> RELAY
The relay responds with “SLAVE DEVICE BUSY”:
PC <--------- 0xFE 0x83 0x06 0xF1 0x02]
The request is repeated:
[0xFE 0x03 0xFF 0x00 0x00 0x7D 0xA1 0xF0] --------> RELAY
Now the relay sends the events format:
[A] Position within file (Unsigned 32 bits)
[B] Block size (Unsigned 16 bits)
PC --------- [0xFE 0x03 0xFA 0x00 0x00 0x00 0x00 0x00 0xF4 0x46 0x4F 0x52 0x4D 0x41
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