CHAPTER 4: SETPOINTS DEVICE
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–25
The master/slave packets have the following format:
Table 4-5: Master Packet Format for Function Code 03H
Table 4-6: Slave Packet Format for Function Code 03H
ASE 2000 V2 Example
--> 00 00 00 00 00 06 FE 03 4A 8A 00 04
--> 00 00 00 00 00 0B FE 03 08 00 00 04 B0 00 00 00 64
Administrator Login and Commands via Modbus for 8 Series Relays
Logging in as Administrator
Logging in as Administrator is demonstrated in the example below. The process requires
writing 44 bytes which consist of the Role ID and Password. Password characters are 22
bytes and role characters are also 22 bytes. The logging in must be done using a single
Modbus command using Function 10H (Store Multiple Setpoints).
The following table shows data to be written to the relay to login as Administrator. The
relay password in this example is 0.
Table 4-7: Data Written to Relay to Login as Administrator
Address Data
006B 022B
006C 0000
006D 0064
MASTER TRANSMISSION BYTES EXAMPLE DESCRIPTION
SLAVE ADDRESS 1 FE message for slave 254
FUNCTION CODE 1 03 read registers
DATA STARTING ADDRESS 2 4A 8A data starting at 4A8A
NUMBER OF SETPOINTS 2 00 04 4 registers = 8 bytes total
CRC (low, high) 2 67 F4 CRC error code
SLAVE RESPONSE BYTES EXAMPLE DESCRIPTION
SLAVE ADDRESS 1 FE message from slave 254
FUNCTION CODE 1 03 read registers
BYTE COUNT 1 08 4 registers = 8 bytes total
DATA 1 2 00 00 value in address 4A8A (16-bit)
DATA 2 2 04 B0 value in address 4A8B (16-bit)
DATA 3 2 00 00 value in address 4A8C (32-bit)
DATA 4 2 00 64
CRC (low, high) 2 E7 75 CRC error code
Description Memory Map Address Value to be written
DEC HEX DEC HEX
Role Characters 1 and 2 62242 F322 16740 4164
Role Characters 3 and 4 62243 F323 28009 6D69
Role Characters 5 and 6 62244 F324 28265 6E69
Role Characters 7 and 8 62245 F325 29556 7374
Role Characters 9 and 10 62246 F326 29281 7261
Role Characters 11 and 12 62247 F327 29807 746F
Role Characters 13 and 14 62248 F328 29184 7200
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