YOKOGAWA UTAdvanced Series, User Manual

Page: 62 / 866

3-31
IM 05P07A01-01EN
Description of RS-485 Communication (for UT
Advanced with RS-485 Communication)
3

WRR Reading D registers and I relays on a word-by-word basis in random order

Function
Reads the status of the individual registers, on a word-by-word basis, specified in a
random order by the specified number of words.
• The number of bits to be read at a time is 1 to 32 (decimal).
• For details on the response format at an error, see “3.2.3 Configuration of Response.”
• The command/response shown below includes the checksum function. When performing
communication without the checksum, do not include the 2-byte checksum element in the
command.

Command/Response (during normal operation)
Number of
bytes
1 2 2 1 3 2 5 1 5 1
Command
element
STX Address
No.
(ADR)
CPU
No. (01)
Response
waiting
time
WRR Number
of words
(n)
Register
No. 1
, or
space
Register
No. 2
, or
space
Continuation of command
• • • 5 2 1 1
• • • Register
number n
Checksum ETX CR
Number of
bytes
1 2 2 2 4 4 • • • 4 2 1 1
Response
element
STX Address
No.
(ADR)
CPU
No. (01)
OK dddd1 dddd2 • • • ddddn Checksum ETX CR
Responses are returned as a 4-digit character string in Hex (0000 to FFFF).
ddddn: Read data of specified number of words
ddddn is a Hex character string. (n = 1 to 32)

WRW Writing data into D registers and I relays on a word-by-word basis in random order

Function
Writes register information specified for each register into the registers specified in a
random order by the specified number of words.
• The number of words to be written at a time is 1 to 32 (decimal).
• For details on the response format at an error, see “3.2.3 Configuration of Response.”
• The command/response shown below includes the checksum function. When performing
communication without the checksum, do not include the 2-byte checksum element in the
command.

Command/Response (during normal operation)
Number of
bytes
1 2 2 1 3 2 5 1 4 1
Command
element
STX Address
No.
(ADR)
CPU
No. (01)
Response
waiting
time
WRW Number
of words
(n)
Register
No. 1
, or
space
dddd1 , or
space
Continuation of command
5 1 4 • • • 5 1 4 2 1 1
Register
number 2
Comma
or space
dddd2 • • • Register
No. n
, or
space
ddddn Checksum ETX CR
Write information is specified as a 4-digit character string in Hex (0000 to FFFF).
ddddn: Repeating of register No. and writing information for number of specified words.
ddddn is a Hex character string. (n = 1 to 32)
Number of
bytes
1 2 2 2 2 1 1
Response
element
STX Address
No.
(ADR)
CPU
No. (01)
OK Checksum ETX CR
3.2 PC Link Communication