Galvanic Rs485 Communication Module - ABB REG670 Technical Manual

1MRK502052-UEN B
21.2.13
21.2.13.1
21.2.13.2
Technical manual
Table 919: SLM – SPA/IEC 60870-5-103/DNP3 port
Quantity
Optical connector
Fiber, optical budget
Fiber diameter
*) depending on optical budget calculation

Galvanic RS485 communication module

Introduction
The Galvanic RS485 communication module (RS485) is used for DNP3.0 and IEC
60870-5-103 communication. The module has one RS485 communication port. The
RS485 is a balanced serial communication that can be used either in 2-wire or 4-wire
connections. A 2-wire connection uses the same signal for RX and TX and is a
multidrop communication with no dedicated Master or slave. This variant requires
however a control of the output. The 4-wire connection has separated signals for RX
and TX multidrop communication with a dedicated Master and the rest are slaves. No
special control signal is needed in this case.
Design
The RS485 is a PMC card and it is factory mounted as a mezzanine card on the NUM
module.
RS485 connector pinouts
The arrangement for the pins in the RS485 connector (figure 538) are presented in
table 920:
Table 920: The arrangement for the pins
Pin Name 2-wire
1 RS485+
2 RS485–
3 Term
4 N.A.
5 N.A.
6 N.A.
Range or value
Glass fiber: type ST
Plastic fiber: type HFBR snap-in
Glass fiber: 11 dB (1000m/3000ft m typically *)
Plastic fiber: 7 dB (25m/80ft m typically *)
Glass fiber: 62.5/125 mm
Plastic fiber: 1 mm
Name 4-wire Description
TX+ Receive/transmit high or transmit high
TX– Receive/transmit
T-Term Termination resistor for transmitter (and receiver
in 2–wir case) (connect to TX+)
R-Term Termination resistor for receiver (connect to RX+)
RX– Receive low
RX+ Receive high
Section 21
IED hardware
1187