Fimer FMR-PVS-10-TL-SX, Руководство по эксплуатации продукта

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• Install the signals connection box (08) by screwing the 4 locking
screws present on it (see paragraph “3.5.2 Tightening torques”).
• Digital input and RS485 cable gland (20) ring (see paragraph
“3.5.2 Tightening torques”).
ATTENTION – A If any cable is installed on the other cable
gland remember to screw it.
5.6.2.1 RS-485 line
The RS-485 line can be used in one of the following adjustable
modalities:
• Connection of the inverter to a third party system (slave mode).
• Connection of supported external devices (like VSN800 Weather
Station, meter, etc). In this case data from accessories will be logged
and transferred to the cloud by inverter itself (master mode).
The RS-485 serial communication line is available on the Digital
input and RS-485 connector (12) terRT, -RT, RN and .
RN
+R
T
-R
T
RS-485
RTN
R ON
/OFF
DRM0
RS-485 third party system
The use of the inverters over the RS-485 line is recommended in
case of using third party RS-485 control systems.
NOTE –
D
RS-485 line supports Modbus/RTU SUNSPEC
compliant Modbus protocol.
• Connect one or more units (daisy-chain) observing the
correspondence between the signals as for the table below:
Signal Symbol
+RT
-RT
485 RN
+RT
-RT
485 RN
Positive
data
+RT
Negative
data
- RT
Reference RN
Shield
ATTENTION –
A
Shield continuity must be provided along the
communication line and must be grounded in a single point.
ATTENTION – A Use a shielded twisted pair cable with
characteristic impedance of Z0=120 Ohm in case of long
distance connection.
NOTE –
D
The communication line must be terminated on the
first element of the chain which normally corresponds to the
“third party system”.