YOKOGAWA UTAdvanced Series, User Manual

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3-21
IM 05P07A01-01EN
Description of RS-485 Communication (for UT
Advanced with RS-485 Communication)
3
3.2.2 Configuration of Commands
The structure of commands sent to the UTAdvanced from the host computer is as
follows:
(1) (2) (3) (4) (5) (6) (7) (8) (9)
Number of bytes 1 2 2 1 3 Variable length 2 1 1
Element STX Address
No. (ADR)
CPU
No. (01)
Response
waiting time
Command Data to command
corresponding
Checksum ETX CR
(1) STX (Start of Text)
This indicates the start of the command. ASCII code is 02 in hexadecimal.
(2) Address No. (01 to 99)
This No. is for enabling the host computer to identify the UTAdvanced at the
communication destination. (These are the ID Nos. of each UTAdvanced.)
(3) CPU No.
Fixed at “01”
(4) Response waiting time
A waiting time (time delay) from transmission of a command up to reception of a
response can be set.
Set the response waiting time within 0 to 600 ms using characters 0 to F.
Character Response waiting time (unit: ms)
0 0 (Note)
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
Note: Even if the response waiting time is set to
“
0,
”
processing is delayed by the time taken to
execute internal processing.
(5) Command (For a list of commands, see “3.2.6 Commands and Responses.”)
The instruction (command) from the host computer is specified.
(6) Data corresponding to command
Internal register (D register / I relay), number of data points, etc. are specified.
Data type Data content Data form
PV high and low limits, target
setpoints, and others
PV range (EU) data Numerical data not including the
decimal point
Bias, deviation alarms, and others PV range span (EUS) data Numerical data not including the
decimal point
Proportional bands, output high and
low limits and others
% data (0.0 to 100.0%) Numerical data not including the
decimal point
0 to 1000
Various modes, alarm types and
others
Seconds, absolute values, and
data without unit
Absolute value not including the
decimal point
3.2 PC Link Communication