OG_MU-4-434_v10e Circuit Design, Inc.
50
OPERATION GUIDE
5.4.3.2 @CR Target station RSSI absolute level measurement
Measures the RSSI (Received Signal Strength Intensity) of the specified target station. The RSSI value is the
received signal strength of the target station. In addition, the floor noise level of the field where the target station is
located can also be acquired. The measured value is output as a 2-digit hexadecimal number in ASCII characters
that expresses the absolute value for RSSI. The code of the RSSI value acquired is minus.
Format 1: ‘@’ + ‘CR’ + ‘/’ + route infor CRLF
Format 2: ‘@’ + ‘CR’ + CRLF
Details
Format1: ‘@CR’ ‘/’ rr,rr,...,rr ‘
C
R
L
F
’
Format2: ‘@CR’ ‘/’ ‘
C
R
L
F
’
rr,rr,...,rr: Shows the route information in 2 hexadecimal digits and ASCII characters. Value: 00h to FEh, number
of relay stations maximum 10 units
With Format 1, the route information is entered directly in the command.
With Format 2, transmission is based on route information set in the route register with the RT command or on
the content of the Destination ID. When entering the route information, enter the Equipment ID of the target unit
at the end. If no route information is set (NA set for the RT command), the equipment set as the Destination ID
will be the target station.
It is possible to make the source unit the target. In this case, after entering one or more relay stations, enter the
Equipment ID of the source unit at the end.
Example: Measure the RSSI of target equipment number 8F. The relay stations are 01, 02, and 03.
・Source station 5F status
①Issue the monitor command
Format 1:@CR / 01,02,03,8F C
R
L
F
Format 2:@CR C
R
L
F
②Monitor response:*CR=00 C
R
L
F
⑥Receive response from the target station
(issued after the relay time has elapsed)
・Target station 8F status
④There is no data receive
⑤Return the RSSI value of
the current channel
②
⑥
④
User
controller
User
controller
Target
station
EI=8F
Relay
station
EI=03
Relay
station
EI=01
Relay
station
EI=02
Source
station
EI=5F
When RM=CD *DR=04 5580 C
R
L
F
③Request
①
③Request
⑤Return the RSSI value
When RM=TX *DR=14 C
R
L
F
S -85dBm N -128dBm C
R
L
F
Signal level
Field noise level
Measure and return the packet
signal level and field noise.
Receive response (Source station output)
The signal level and filed noise level of the target station are output as the receive response. The measured value
is output following the data size as a 2-digit hexadecimal number that expresses the absolute value for RSSI. The
RSSI value for one channel is expressed as 2-byte ASCII characters and the code of the RSSI value acquired is
minus.
Source station output
*DR = 04 55 80
C
R
L
F
* Hex ‘55’=
-85 dBm, Hex ‘80’=
-128 dBm, ‘55’=35,35 (ASCII code)
