Serial Interface; Serial Interface Description - gefran SIEIDrive AVy Series Quick Start Up Manual

5.4. SERIAL INTERFACE

5.4.1. 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
38.4 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
Device address parameter. Further information concerning the parameters to be transfered, their type and
value range is given in the table contained in section 8, "Parameter lists".
5
The RS 485 on the AVy series devices 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 in
case of temporary connection of one drive connected. 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.
N !
OTE
N !
OTE
Ch.5 72
XS
0 V S
+5 V S
150 R
S5 S6
S41
TxA/RxA
TxB/RxB
S40
4 2 1
3
9 8 7 6
Figure 5.4.1.1: RS485 Serial Interface
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.
With S40 and S41 mounted the drive supply the serial line. This modality is allowed on
point-to-point connection without galvanic isolation only.
A connection point to point can be done using "PCI-485" option interface (S40 and S41
mounted).
For multidrop connection (two or more drive), an external power supply is necessary
(pin 5 / 0V and pin 9 / +5V).
Pins 6 and 8 are reserved for use with the "PCI-485" interface card.
When connecting the serial interface ensure that
+5 V
PE
RS485
AVy - HGB