Micromod Micro-DCI: 53ML5100A LOADING STATION REV. 1 FIRMWARE - Manual (Page 13)

53ML5100A Manual Loading Station
Supplement to the Instruction Bulletin
Datalink Communications 9
4.1.1 Message Types
The types of messages that are sent between the host personal computer and a Datalink network instru-
ment are formatted as follows:
HOST PERSONAL COMPUTER TO INSTRUMENT:
1. INTERROGATE - This message requests up to 20
H
(32 decimal) consecutively stored bytes,
beginning at the specified memory address location of the addressed instrument.
01111110 E0
H
+ I.A. NUM LO ADD HI ADD LRC
2. CHANGE - This message sends up to 20
H
(32 decimal) bytes of new data to the addressed
instrument.
01111110 A0
H
+ I.A. NUM LO ADD HI ADD Data 1 XXXXXXXXX Data N LRC
3. CHANGE BITS - This message alters only the specified bits of the specified bytes in the
addressed instrument. (NUM = 2n)
01111110 C0
H
+ I.A. NUM LO ADD HI ADD Mask 1 State 1 XXXX Mask N
State N LRC
4. ACKNOWLEDGE - This message signals the addressed instrument that its last echoed
change message was received correctly; the instrument then performs the change requested.
01111110 80
H
+ I.A.
INSTRUMENT TO HOST PERSONAL COMPUTER:
1. RESPONSE - This message furnishes the data requested by the INTERROGATE command
of the host personal computer. It is also used to echo back the previous CHANGE message of
the host personal computer.
01111110 20
H
+ I.A. NUM LO ADD HI ADD Data 1 XXXXX Data N LRC