YOKOGAWA F3LC11-1F, User Manual

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A2-5
IM 34M6H41-02E 2nd Edition : Aug. 1, 2005-00
n
Formats of Access Commands/Responses
Only uppercase alphabetic characters A-Z (ASCII codes $41-$5A) can be used in
commands and responses.
l
Format of Commands (Higher-level equipment → FA-M3 (PC Link
Module))
St
at
ion no
.
CP
U no
.
Command response, parameters
Checksum
E
T
X
C
R
S
T
X
FA20001.VSD
Response w
a
it ti
me
(1) STX
The STX character (control code) identifies the beginning of text. Its ASCII code is
“$02” so the character cannot be entered directly from the normal keyboard. To
enter the character, hold the [Ctrl] key and press the [B] key (^B) in a terminal
software application or other software.
(2) Station Number (2 characters)
In RS-232-C models of the Personal Computer Link module, the station number is
fixed at “01”.
In RS-422/485 models, the PC link station number is set using the two rotary
switches in front of the module. (setting range: 01-32).
(3) CPU Number (2 characters)
When multiple CPUs are used in the FA-M3, this specifies the target CPU for a
command. (Specify a number from “01” to “04". If there is only one FA-M3 CPU
module, specify “01”).
When reading from X, Y, E relays and R registers, the same value is read
regardless of the specified CPU number. If the CPU number assigned in the I/O
configuration is not specified during writing, output refresh cannot be carried out.
(4) Response Wait Time (one character)
You can specify the waiting time (time delay) for a response following a command
transmission. Set a longer wait time if programming is done using a BASIC
interpreter, etc. on the higher-level computer. (Setting range: 0 to F).
Char
Response
Wait Time
(ms)
0 0
1 10
2 20
3 30
4 40
5 50
6 60
7 70
8 80
9 90
A 100
B 200
C 300
D 400
E 500
F 600
Processing
Response
Command
Response wait time
Internal processing time *1
Higher-level
computer
(display)
Personal
Computer
Link Module
FA-M3
CPU module
1 scan 1 scan
Break in
scanning
Break in
scanning
FA20002.VSD
Processing
Processing
*1 Even if response wait time is set to 0, processing will be delayed by the internal processing time.