TECHNICAL INFORMATION
Source: Controller
Destination: PC
−
<STX>
(Start of transmission) = 0x02
−
<ADDR>
(Unit address) = 0x80 (for RS 232)
<ADDR>
(Unit address) = 0x80 + device num-
ber (0 to 31) (for RS 485)
02 80 06 03 38 35
STX ADDR ACK ETX
CRC
−
<WIN>
(Window) = a string of 3 numeric char-
acter indicating the window number (from ‘000’
to ‘999’); for the meaning of each window see
the relevant paragraph.
−
<COM>
(Command) = 0x30 to read the window,
0x31 to write into the window
Command: STOP
Source: PC
Destination: Controller
−
<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:
02 80 30 30 30 31 30 03 42 32
STX ADDR
WINDOW
WR OFF ETX
CRC
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)
Source: Controller
Destination: PC
02 80 06 03 38 35
STX ADDR ACK ETX
CRC
Command: SOFT-START (ON)
Source: PC
Destination: Controller
−
<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.
02 80 31 30 30 31 31 03 42 32
STX ADDR
WINDOW
WR ON ETX
CRC
The addressed SLAVE will respond with an
AN-
SWER
whose structure depends from the
MESSAGE
type.
Source: Controller
Destination: PC
When the
MESSAGE
is a reading command, the
SLAVE will respond transmitting a string with the
same structure of the
MESSAGE
.
02 80 06 03 38 35
STX ADDR ACK ETX
CRC
NO
T
E
Command: SOFT-START (OFF)
Source: PC
Destination: Controller
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>
02 80 31 30 30 31 30 03 42 33
STX ADDR
WINDOW
WR OFF ETX
CRC
Examples:
Command: START
Source: PC
Destination: Controller
Source: Controller
Destination: PC
02 80 30 30 30 31 31 03 42 33
STX ADDR
WINDOW
WR ON ETX
CRC
02 80 06 03 38 35
STX ADDR ACK ETX
CRC
34
87-900-946-01(B)
