Ditel RS2 Guide Rapide D'installation page 3

PROTOCOLO /
• PROTOCOL ASCII
Format
Formato /
MESSAGE TO SEND
* D d C C X ................... X
"*" [ASCII 42] START of message
"D d" Adress (00 to 99)
"C C" Command (see table)
"X...X" Data bytes
"CR" [ASCII 13] END of message
• PROTOCOL ISO1745
Format
Formato /
MESSAGE TO SEND
SOH D d STX C C X ...... X ETX BCC
"SOH" [ASCII 01] START of message
"D d" Adress (00 to 99)
"STX" [ASCII 02] START of text
"C C" Command (see table)
"X...X" Data bytes
"ETX" [ASCII 03] END of text
"BCC" Checksum (OR-Exclusive Data bytes)
Note : (if<32 then add 32)
• PROTOCOL MODBUS ( see manual MODBUS at
PROTOCOLE /
/ Format : 1 bit START, 8 bits DATA, NO parity, 1 bit de STOP.
CR
/ Format : 1 bit START, 7 bits DATA, 1 bit EVEN parity, 1 bit de STOP.
PROTOCOL : ASCII
RESPONSE MESSAGE TO RECEIVE
SP
"SP" [ASCII 32] Espace.
"X...X" Data bytes (only if data is requested)
"CR" [ASCII 13] END of message.
RESPONSE MESSAGE WITH DATA
SOH D d
"SOH" [ASCII 01] START of message
"D d" Adress (00 to 99)
"STX" [ASCII 02] START of text
"X...X" Data bytes
"ETX" [ASCII 03] END of text
"BCC" Checksum
RESPONSE MESSAGE WITHOUT DATA
D d ACK
"ACK" [ASCII 06] Message OK
"NAK" [ASCII 21] Message No OK
TABLE OF COMMANDS ASCII / ISO1745
www.ditel.es )
ISO1745
X .......................... X
STX X .................. X
or
MODBUS RTU
CR
ETX BCC
D d NAK