GEFRAN-SIEI ARTDrive Vector V2 Series - Serial Interface

52 • Chapter 4 Wiring Procedure ARTDrive V2 series - Instruction Manual
4.4 Serial Interface
4.4.1 Serial Interface Description
The RS 485 serial interface enables data transfer via a loop made of two
symmetrical, twisted conductors with a common shield. The maximum
transmission distance is 1200 m (3936 feet) with a transfer rate of 9.6 KBaud.
The transmission is carried out via a differential signal. RS 485 interfaces are
bus-compatible in half-duplex mode, i.e. sending and receiving take place in
sequence. Up to 31 AVy devices (up to 128 address selectable) can be networked
together via the RS 485 interface. Address setting is carried out via the M00.00
- Slave address parameter (COM / RS485 menu).
The serial protocol can be set via M00.02 - Protocol type parameter (COM /
RS485 menu), which allows to set following types: SLINK 4 (default), Modbus
RTU and Jbus.
12
3
45
9876
150 R
TxA/RxA
TxB/RxB
0VS
+5VS
S5 S6
PE
RS485
XS
100 R
470 R 470 R
+5 V
Figure 4.4.1.1: RS485 Serial Interface
The RS 485 on the AVy series device is located on the Regulation card in the
form of a 9-pole SUB-D socket connector (XS).The communication may be with
or without galvanic isolation: by using galvanic isolation an external power supply
is necessary (+5V). Communication without galvanic isolation are suggested
only if making a temporary connection to one drive. The differential signal is
transferred via PIN 3 (TxA/RxA) and PIN 7 (TxB/RxB). Bus terminating resistors
must be connected at the physical beginning and end of an RS 485 bus in order
to prevent signal reflexion. The bus terminating resistors on AVy series devices
are connected via jumpers S5 and S6. This enables a direct point-to-point
connection with a PLC or PC.
NOTE! Ensure that only the first and last drop of an RS 485 bus have a bus terminating
resistor (S5 and S6 mounted). In all other cases (within the line) jumpers S5
and S6 must not be mounted.