Omron V600 Series Operation Manual page 32

Command Format
3-3-2 Command Format
Name
This contains the 2-character abbreviation for the command function (see Command Response Table,
Header
page 29 ). If it is a response, the same abbreviation as that of the command sent is entered here.
Text This contains the command response.
ASCII/Hexadecimal Code Specification
Destination R/W Head No. Specification
Head Address
Write Data/Read No.
Terminator This indicates end of command response.
Controller no. Only used for 1 to N procedure, a Controller numbers 00 to 15 is added after @ mark.
FCS (see note Only used for 1 to N procedure, horizontal parity check is used.
1)
3-3-3 FCS Computation Procedure (V600-CA2A-V
30
The following explains the format of commands sent from the host computer to
the ID Controller.
For 1 to 1 Procedure
1 frame = 266 characters max.
X X X X
Header
For 1 to N Procedure
@ X X X
Controller No.
(Unit No.)
1. See 3-3-3 FCS Computation Procedure (V600-CA2A-V
Note
on the FCS (frame check sequence).
2. The V600-CA1A-V
and 1 to N (N = 1 only) procedure. The V600-CA2A-V
interface can be used for the 1 to 1 and 1 to N (N = 1 to 16) procedure.
3. A controller number must be designated decimally within a range between
@00 and @15.
FCS operates by converting the 8-bit data representing the exclusive OR of the
codes for the characters from the head of the frame (@ mark) to the final charac-
ter of text into two characters of ASCII code.
∗
.......
X
Text Terminator
1 frame = 271 characters max.
.......
X X X
Header Text
Contents
with an RS-232C interface can be used for the 1 to 1
Section
∗
X X X
FCS Terminator
Only) for details
with an RS-422
Only)
3-3