ABB ControlIT 53MC5000 - Page 344

B.1.4 COMMUNICATION TRANSACTION EXAMPLES
Transaction A Example
-
Host or SUPERVISOR-PC requests 9 bytes of data beginning at hexa-
decimal memory address 1000
H
from the controller at Datalink address 03.
1. Host or SUPERVISOR-PC sends
INTERROGATE
message.
01111110 11100011 00001001 00000000 00010000 11111100
SOH Command NUM LO ADD HI ADD LRC
+ I.A.
2. Controller sends
RESPONSE
message.
01111110 00100011 00001001 00000000 00010000 XXXXX XXXXX XXXXX LRC
SOH Command NUM LO ADD HI ADD Data 1..................Data 9
+ I.A.
Transaction B Example - Host or SUPERVISOR-PC sends two bytes of new data, to be loaded
into the controller at Datalink address 03 beginning at hexadecimal memory address 1000
H
.
1. Host sends
CHANGE
message.
01111110 10100011 00000010 00000000 00010000 00001000 00001100 11001001
SOH Command NUM LO ADD HI ADD Data 1 Data 2 LRC
+ I.A.
2. Controller sends
RESPONSE
message.
01111110 00100011 00000010 00000000 00010000 00001000 00001100 01001001
SOH Command NUM LO ADD HI ADD Data 1 Data 2 LRC
+ I.A.
3. Host sends
ACKNOWLEDGE
message.
01111110 10000011
SOH Command
+ I.A.
4. Controller performs the change requested at end of the current program scan.
Appendix B. Communications
B-5