YOKOGAWA UTAdvanced Series, User Manual

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3-29
IM 05P07A01-01EN
Description of RS-485 Communication (for UT
Advanced with RS-485 Communication)
3

BRS Specifying I relays to be monitored on a bit-by-bit basis

Function
Specifies the numbers of I relays to be monitored on a bit-by-bit basis. Note that this
command simply specifies I relays. Actual monitoring is performed by the BRM command
after the I relay numbers are specified with this command.
When the volume of data is large and you wish to increase the communication rate, it
is effective to use a combination of the BRS and BRM commands rather than the BRD
command. If the power supply is turned off, the specified I relay numbers will be erased.
• The number of registers to be specified at a time is 1 to 32.
• 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
BRS Number
of bits
(n)
I relay
No. 1
, or
space
I relay
No. 2
, or
space
Continuation of command
• • • 5 2 1 1
• • • I relay
No. n
Checksum ETX CR
Number of
bytes
1 2 2 2 2 1 1
Response
element
STX Address
No.
(ADR)
CPU
No. (01)
OK Checksum ETX CR

BRM Monitoring I relays on a bit-by-bit basis

Function
Reads the ON/OFF status of the I relays that have been specified in advance by the BRS
command.
• Before executing this command, the BRS command must always be executed to
specify which I relays are to be monitored. If no relay has been specified, error code
06 is returned. This error also occurs if the power supply is turned off.
• For details on the response format at an error, see “3.2.3 Configuration of Response.”
• The command 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 1 1
Command
element
STX Address
No.
(ADR)
CPU
No. (01)
Response
waiting
time
BRM Checksum ETX CR
Number of
bytes
1 2 2 2 1 1 1 • • • 1 2 1 1
Response
element
STX Address
No.
(ADR)
CPU
No. (01)
OK d1 d2 d3 • • • dn Checksum
ETX CR
The response is “0” when the status is OFF or “1” when ON.
dn: read data of the specified number of bits (n = 1 to 32)
dn = 0 (OFF)
dn = 1 (ON)
3.2 PC Link Communication