gefran AGy-EV Series - Serial Interface; In General

AGy-EV Instruction manual Chapter 5 - Wiring Procedure • 41
5.4 Serial Interface
5.4.1 In General
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 up to 38,400 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 AGy-EVdevices (up to 99 address selectable) can be networked together
via the RS 485 interface.
12
3
45
98 76
150 R
TxA/RxA
TxB/RxB
0VS
+5VS
S3 S4
PE
RS485
XS
100 R
470 R 470 R
+5 V
S5
S6
Figure 5.4.1.1: RS485 Serial Interface
The RS 485 on the AGy-EV 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: when using galvanic isolation an external
power supply is necessary (+5V).
Communication without galvanic isolation is suggested only in case of temporary connections for setup with 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 reflection. The bus
terminatingresistors on AGy-EV drives are connected via jumpers S3 and S4. 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 (S3 and S4
mounted). In all other cases (within the line) jumpers S3 and S4 must not be mounted.
A connection point to point (without galvanic isolation) can be done using “PCI-485” option interface (S5 and S6 mounted).
With S5 and S6 mounted the drive supply the serial line. This modality is allowed on point-to-point connection without
galvanic isolation only.
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:
- only shielded cables are used
- power cables and control cables for contactors/relays are routed separately
NOTE!
As for the connection of the serial line, make sure that the power cables and the cables
controlling the contactors and the auxiliary relays are located into different panduits.