GE 889 Instruction Manual page 155

CHAPTER 4: SETPOINTS
Administrator Login and Commands via Modbus for 8 Series Relays
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Address
006B
006C
006D
The master/slave packets have the following format:
Table 4-5: Master Packet Format for Function Code 03H
MASTER TRANSMISSION
SLAVE ADDRESS
FUNCTION CODE
DATA STARTING ADDRESS
NUMBER OF SETPOINTS
CRC (low, high)
Table 4-6: Slave Packet Format for Function Code 03H
SLAVE RESPONSE
SLAVE ADDRESS
FUNCTION CODE
BYTE COUNT
DATA 1
DATA 2
DATA 3
DATA 4
CRC (low, high)
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
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
Description
Role Characters 1 and 2
Role Characters 3 and 4
Role Characters 5 and 6
Role Characters 7 and 8
Role Characters 9 and 10
Role Characters 11 and 12
Role Characters 13 and 14
Data
022B
0000
0064
BYTES EXAMPLE
1 FE
1 03
2 4A 8A
2 00 04
2 67 F4
BYTES EXAMPLE
1 FE
1 03
1 08
2 00 00
2 04 B0
2 00 00
2 00 64
2 E7 75
Memory Map Address
DEC HEX
62242 F322
62243 F323
62244 F324
62245 F325
62246 F326
62247 F327
62248 F328
DESCRIPTION
message for slave 254
read registers
data starting at 4A8A
4 registers = 8 bytes total
CRC error code
DESCRIPTION
message from slave 254
read registers
4 registers = 8 bytes total
value in address 4A8A (16-bit)
value in address 4A8B (16-bit)
value in address 4A8C (32-bit)
CRC error code
Value to be written
DEC HEX
16740 4164
28009 6D69
28265 6E69
29556 7374
29281 7261
29807 746F
29184 7200
DEVICE
4–25