ComAp Inteli Mains NT BaseBox, Communications Manual

Page: 139 / 152

IGS-NT Communication Guide
139
Standard response
Byte Meaning Note
0 Controller address Same as in the query
1 16 Same as in the query
2
3
Communication object number
upper byte (MSB)
lower byte (LSB)
Same as in the query
4
5
Communication object length expressed by the number of
registers
upper byte (MSB)
lower byte (LSB)
Same as in the query
6
7
Check field CRC
lower byte (LSB)
upper byte (MSB)
see Check field calculation on
page 143
Exceptional response
Byte Meaning Note
0 Controller address Same as in the query
1 144 Function code + 128
2 2 see Error list on page 150
3
4
Check field CRC
lower byte (LSB)
upper byte (MSB)
see Check field calculation on page 143
9.3.3 Alarm list reading
It is not possible to read alarm list simultaneously from more terminals. If the terminal starts reading, the reading
is locked for other terminals. It is unlocked 5 seconds after last reading of alarm list. The locked terminal
indicates to another terminal an error message.
The whole alarm list is stored in the cache memory at the moment of locking and the following reading of records
is performed from this memory. Locking is done only while reading the first record. So the successive reading
from the first to the last record is supposed.
Alarm list reading via Modbus
Since firmware version 2.5 and higher is possible to read alarm list via modbus as a binary attributes of
protection states. For this function was reserved these ranges of registers.
Registers Register addresses Number of Registers Access Type of Data
45751 to 45875 5750 to 5874 125 Reading Domain
45876 to 46000 5875 to 5999 125 Reading Domain
46201 to 46325 6200 to 6324 125 Reading Domain