Table 919:
SLM – SPA/IEC 60870-5-103/DNP3 port
Quantity
Range or value
Optical connector
Glass fiber: type ST
Plastic fiber: type HFBR snap-in
Fiber, optical budget
Glass fiber: 11 dB (1000m/3000ft m typically *)
Plastic fiber: 7 dB (25m/80ft m typically *)
Fiber diameter
Glass fiber: 62.5/125
m
m
Plastic fiber: 1 mm
*) depending on optical budget calculation
21.2.13
Galvanic RS485 communication module
21.2.13.1
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.
21.2.13.2
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
) are presented in
table
:
Table 920:
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
1MRK502052-UEN B
Section 21
IED hardware
1187
Technical manual
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