23.2.12
Galvanic RS485 communication module
SEMOD174899-1 v1
23.2.12.1
Introduction
SEMOD158664-5 v3
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.
23.2.12.2
Design
SEMOD158668-1 v1
SEMOD158670-4 v3
RS485 is a PC-MIP card, and it is factory mounted as a mezzanine card on the Analog
digital conversion module (ADM).
RS485 connector pinouts
SEMOD158670-10 v1
The arrangement for the pins in the RS485 connector (figure
) are presented in
table
:
Table 665:
The arrangement for the pins
Pin
Name 2-wire
Name 4-wire
Description
1
RS485+
TX+
Receive/transmit high or transmit high
2
RS485–
TX–
Receive/transmit
3
Term
T-Term
Termination resistor for transmitter (and receiver in
2–wir case) (connect to TX+)
4
N.A.
R-Term
Termination resistor for receiver (connect to RX+)
5
N.A.
RX–
Receive low
6
N.A.
RX+
Receive high
1MRK 511 408-UUS A
Section 23
IED hardware
Phasor measurement unit RES670 2.2 ANSI
845
Technical manual
Содержание Relion RES670
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