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5.5.1.2. Interface RS-485 Monitor mode
RS-485 interface can work in
Monitor
mode, in which
device is able to listen to traffic in the RS-485 network and react to spe
-
cific register of responses of the selected device. The PCE-P30U tran
-
sducer must have the same communication parameters as the device
being listened to. The RS-485
Monitor
mode is switched on by selecting
the appropriate mode from menu:
Mbus 485
→
Mode
→
Monitor
or by entering the value “1” into the register 4042.
In the RS- 485
Monitor
mode the following parameters should be
configured in the
Mbus 485
menu:
The parameters (4 - 6) may also be configured by RS-485 (registers
4048- 4052) before the RS-485
Monitor
mode is selected. After selec
-
ting the RS-485
Monitor
mode it is impossible for other Master device to
poll the transducer.
Similarly as in the RS-485
Master
mode the registers being liste-
ned to are copied to the register area from the range 8000...8049.
The first register being listened to is copied to the register 8000 and it can
be treated as the main displayed value. If the parameter
No.ofVal
> 1,
then the values of the following registers being listened to reach the follo-
wing registers from the range 8000...8049. For example, when we want
to display additionally the value of the third register being listened to,
Table 11
Item
Modbus
1
Address
Address of the device being listened to
2
ModeUnit
Transmission mode on the connection
3
BaudRate
Baud rate
4
Base.Reg
Base monitored register number
5
ValType
Type of read out values
6
AnswTime
Maximal time of reply of the device being
listened to [ms]