ABB ControlIT 53MC5000 Instruction Manual 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
1. Host or SUPERVISOR-PC sends INTERROGATE message.
01111110 11100011 00001001 00000000 00010000 11111100
SOH Command
+ I.A.
2. Controller sends RESPONSE message.
01111110 00100011 00001001 00000000 00010000 XXXXX XXXXX XXXXX
SOH Command
+ 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
Host sends CHANGE message.
1.
01111110 10100011 00000010 00000000 00010000 00001000 00001100
SOH Command
+ I.A.
2. Controller sends RESPONSE message.
01111110 00100011 00000010 00000000 00010000 00001000 00001100 01001001
SOH Command
+ 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
from the controller at Datalink address 03.
H
NUM LO ADD
NUM LO ADD
NUM LO ADD
NUM LO ADD HI ADD
HI ADD LRC
HI ADD Data 1..................Data 9
HI ADD Data 1
Data 1 Data 2
LRC
.
H
11001001
Data 2 LRC
LRC
B-5