Tabla de contenido
The field length is variable according to the
data type as per the following table:
FIELD
DATA TYPE
LENGTH
Logic (L)
1
Numeric (N)
6
Alphanumeric (A)
10
− <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
STX ADDR
WINDOW
Source: Controller
Destination: PC
02
80
06
03
38
STX ADDR ACK ETX
VALID
CHARACTERS
'0' = OFF
'1' = ON
'-', '.', '0' . . . '9' right
justified with '0'
from blank to '_' (ASCII)
31
31
03
42
WR
ON
ETX
CRC
35
CRC
Command: STOP
Source: PC
Destination: Controller
02
80
30
STX ADDR
Source: Controller
Destination: PC
02
80
06
STX ADDR ACK ETX
Command: SOFT-START (ON)
Source: PC
Destination: Controller
02
80
31
STX ADDR
Source: Controller
Destination: PC
02
80
06
STX ADDR ACK ETX
Command: SOFT-START (OFF)
Source: PC
Destination: Controller
02
80
31
STX ADDR
33
Source: Controller
Destination: PC
02
80
06
STX ADDR ACK ETX
62
TECHNICAL INFORMATION
30
30
31
30
WINDOW
WR
OFF ETX
03
38
35
CRC
30
30
31
31
WINDOW
WR
ON
ETX
03
38
35
CRC
30
30
31
30
WINDOW
WR
OFF ETX
03
38
35
CRC
87-900-962-01(A)
03
42
32
CRC
03
42
32
CRC
03
42
33
CRC
Tabla de contenido
