CHAPTER 10: MODBUS PROTOCOL MODBUS PROTOCOL
869 MOTOR PROTECTION SYSTEM – COMMUNICATIONS GUIDE 10-7
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 10-16: Data Written to Relay to Login as Administrator
Table 10-17: Login as Administrator Function Format
DATA STARTING ADDRESS 2 04 5C setpoint address 04 5C
NUMBER OF SETPOINTS 2 00 02 2 setpoints
CRC 2 82 7A CRC error code
SLAVE RESPONSE BYTES EXAMPLE DESCRIPTION
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
Role Characters 15 and 16 62249 F329 0 0000
Role Characters 17 and 18 62250 F32A 0 0000
Role Characters 19 and 20 62251 F32B 0 0000
Role Characters 21 and 22 62252 F32C 0 0000
Password Characters 1 and 2 62253 F32D 12288 3000
Password Characters 3 and 4 62254 F32E 0 0000
Password Characters 5 and 6 62255 F32F 0 0000
Password Characters 7 and 8 62256 F330 0 0000
Password Characters 9 and 10 62257 F331 0 0000
Password Characters 11 and 12 62258 F332 0 0000
Password Characters 13 and 14 62259 F333 0 0000
Password Characters 15 and 16 62260 F334 0 0000
Password Characters 17 and 18 62261 F335 0 0000
Password Characters 19 and 20 62262 F336 0 0000
Password Characters 21 and 22 62263 F337 0 0000
Slave# Function Data
Starting
Address
Number
of
Setpoints
Byte
Count
Data 1 Data 2 Data 3 Data 4 Data 5 Data 6 Data 7 Data 8 Data 9
FE 10 F322 0016 2C 4164 6D69 6E69 7374 7261 746F 7200 0 0
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