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 mm
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
538) are presented in
table 920:
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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