Message Types And Commands Description - ABB AW400 Series Instruction Manual

10.1.3 Message Types and Commands Description

The types of messages that are sent between the host and the AW400 are formatted as follows:
Host to AW400
1. Interrogate – This message requests up to 20H consecutively stored bytes, beginning at the specified
memory address location of the addressed AW400.
01111110 E0H + I.A. NUM
2. Change – This message sends up to 20H bytes of new data to the addressed AW400.
01111110 A0H + I.A. NUM
3. Acknowledge – This message signals the addressed AW400 that its last echoed change message was
received correctly; the AW400 performs the change requested.
01111110 80H + I.A.
AW400 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 20 + I.A. NUM LO ADD
H
58
LO ADD HI ADD
LO ADD HI ADD Data 1 XXXXXXX Data N
HI ADD Data 1 XXXXXXX
LRC
LRC
DataN LRC