Regulus uREG, User Manual

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uREG User Manual
92
16.1.3. RS-485 /AUX-485 INTERFACES
All RS-485 communication interfaces of the device with an IF-0 module manufactured as a
4-wire link as standard. Thus, each interface can exchange data in full-duplex.
RS-485 interface lines are arranged in a DB9F connector (female) as follows:

A pin 8 - Data Input (+)

B pin 7 - Data Input (–)

Y pin 2 - Data Output (+),

Z pin 3 - Data Output (–).
The 4-wire interface can be externally reduced to a 2-wire configuration by shorting A and Y
and B with Z in pairs (e.g. in the cable pin). In this case, half-duplex is the only possible
exchange mode.
In both cases, the supervisory system can be linked with many
u REG
units as slave nodes;
however, non-simultaneous exchange is principally less effective and loads the interface
message processor to a greater extent.
The interface has no external signals controlling the direction of information flow. Bus
mastering by the unit’s transmitter occurs after a respond to the received message is ready.
The bus is released one the last stop bit is transmitted. Efficiency of bus mastering and correct
transmission is controlled by the unit’s circuits.
Code-oriented transmission parameters, i.e. baud speed, parity bit selection, duplex range are
to be programmed by means of settings (→ 1
Auxiliary settings → 11 UART communication );
Speed range: 300 ÷ 512000 Bd.
CAUTION:
In order to switch from full-duplex to half-duplex, it is required to bridge pins 8
with 2 and 7 with 3 in DB9M complementary plug.
A reverse operation is not possible.
For the IF-1 (IF-2) module, RS-485 (and AUX-485) interface(s) are adapted to communicate
via optical fiber cables ( FO – f iber o ptic) based on plastic (POF 660 nm)
or glass (G 62.5/125 880 nm) fibers.
Information interchange through RS-485 and AUX-485 interfaces can be provided by
definition via one of several transmission protocols (selectable by Protocol setting) from the
list:

uCZIPstd
(standard), • CAN-PPM2 (IF-3/IF-4),

uCZIPnet
, •
uCZIPstd
Master /for ATS/

DNP 3, • MCZIPStd (Master CZIPstd backward compatibility),

IEC 60870-5-101, • Modbus RTU Slave,

IEC 60870-5-103, • Modbus ASCII Slave,

CZIPstd (backward compatibility), • Modbus RTU Master.
CAUTION:
Each change in the setting must be applied by momentary disconnection an d
reconnection of auxiliary power.
Factory settings of RS-485/AUX-485 connectors are as follows:
→ 115200 Bd, no parity, 2 stop bits, full-duplex, uCZIP std protocol.