TECHNICAL INFORMATION
−
<DATA>
= an alphanumeric ASCII string with
the data to be written into the window. In case
of a reading command this field is not present.
The field length is variable according to the
data type as per the following table:
DATA TYPE
FIELD
LENGTH
VALID
CHARACTERS
Logic (L)
1
‘0’ = OFF
‘1’ = ON
Numeric (N)
6
‘-‘, ‘.’, ‘0’ . . . ‘9’ right
justified with ‘0’
Alphanumeric (A)
10
from blank to ‘_’ (ASCII)
−
<ETX>
(End of transmission) = 0x03
−
<CRC>
= XOR of all characters subsequent to
<STX>
and including the
<ETX>
terminator.
The value is hexadecimal coded and indicated
by two ASCII character.
The addressed SLAVE will respond with an
AN-
SWER
whose structure depends from the
MESSAGE
type.
When the
MESSAGE
is a reading command, the
SLAVE will respond transmitting a string with the
same structure of the
MESSAGE
.
NOTE
Using the RS 485 interface, the message structure
remains identical to the one used for the RS 232
interface, the only difference being that the value
assigned to the ADDRESS
<ADDR>
Examples:
Command: START
Source: PC
Destination: Controller
02 80 30 30 30 31 31 03 42 33
STX ADDR
WINDOW
WR ON ETX
CRC
Source: Controller
Destination: PC
02 80 06 03 38 35
STX ADDR ACK ETX
CRC
Command: STOP
Source: PC
Destination: Controller
02 80 30 30 30 31 30 03 42 32
STX ADDR
WINDOW WR
OFF
ETX
CRC
Source: Controller
Destination: PC
02 80 06 03 38 35
STX ADDR ACK ETX
CRC
Command: SOFT-START (ON)
Source: PC
Destination: Controller
02 80 31 30 30 31 31 03 42 32
STX ADDR
WINDOW WR
ON
ETX
CRC
Source: Controller
Destination: PC
02 80 06 03 38 35
STX ADDR ACK ETX
CRC
Command: SOFT-START (OFF)
Source: PC
Destination: Controller
02 80 31 30 30 31 30 03 42 33
STX ADDR
WINDOW WR
OFF
ETX
CRC
Source: Controller
Destination: PC
02 80 06 03 38 35
STX ADDR ACK ETX
CRC
33
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