Micromod Micro-DCI: 53IT5100B Micro-DCI 4-Channel Indicator Totalizer - Manual (Page 60)

53IT5100B Indicator/Totalizer
INSTRUCTION MANUAL
4. ACKNOWLEDGE - This message signals the addressed instrument that its last echoed change
message was received correctly; the instrument performs the change requested.
01111110 80H + I.A.
INSTRUMENT TO HOST:
1. RESPONSE - This message furnishes the data requested by the INTERROGATE command of the
Host. It is also used to echo back the previous CHANGE message of the Host.
01111110 20H + I.A. NUM LO ADD HI ADD Data 1 XXXXX Data N LRC
Communication Transaction Examples
Transaction A Example - Host requests 9 bytes of data beginning at hexadecimal memory address 1000H
from the instrument at Datalink address 03.
1. Host sends INTERROGATE message.
01111110 11100011 00001001 00000000 00010000 11111100
SOH
Command
+ I.A.
NUM LO ADD HI ADD LRC
2. Instrument
sends RESPONSE message.
01111110 00100011 00001001 00000000
0001000
0
XXXXX XXXXX XXXXX LRC
SOH
Command
+ I.A.
NUM LO ADD HI ADD Data 1 ................. Data 9
Transaction B Example - Host or SUPERVISOR-PC sends two bytes of new data, to be loaded into the
instrument at Datalink address 03 beginning at hexadecimal memory address 1000H.
1. Host sends CHANGE message.
01111110 10100011 00000010 00000000
0001000
0
0000100
0
00001100
1100100
1
SOH
Command
+ I.A.
NUM LO ADD HI ADD Data 1 Data 2 LRC
2. Instrument sends RESPONSE message.
01111110 00100011 00000010 00000000
0001000
0
0000100
0
00001100
0100100
1
SOH
Command
+ I.A.
NUM LO ADD HI ADD Data 1 Data 2 LRC
3. Host
sends ACKNOWLEDGE message.
01111110 10000011
SOH Command
56