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Functions overview
3.2
Functions overview
3.2.1
Applications
The wide area of applications enable the EDS500 series - FSK modems to be used in any cost-
efficient environment using serial communication. Its simplicity and robustness provide ease of
installation as well as long product lifetime.
Analog serial modems of the EDS500 series allow to implement real physical two-or-four wire
shared bus topologies (all modems connect to the same cable) with ranges of up to 30 km.
The compact case without moveable parts for easy installation on DIN rail, a wide range power
supply (24...60 V) with small power consumption, extended temperature range and integrated
overvoltage protection complete the concept of the EDS500 series - FSK modems.
3.2.2
Connectivity
The EDS500 series of analog modems consists of multiple products allowing to establish wide
area connections via customer-owned copper cables. The devices provide a serial interface (V.24 /
RS-232) and a combined two-/four-wire line interface.
A variety of communication schemes are supported to provide connectivity to clients and other
communication devices:
• 24 channels each 50 bps (ITU-T/CCITT R.35)
• 12 channels each 100 bps (ITU-T/CCITT R.37)
• 6 channels each 200 bps (ITU-T/CCITT R.38a)
• 2 channels each 600 bps
• 1 channel 1200 bps (ITU-T/CCITT V.23)
• 1 channel 2400 bps
• 1 channel 9600 bps
500FSD devices can be used in point-to-point (end-to-end) and multidrop (partyline) applications.
The transmission is transparent, supporting byte oriented (e.g. IEC 60870-5-101, IEC60870-5-103,
IEC 62056-21, RP570/71, DNP, Modbus, SEAB 1F, TG809 or SINAUT) as well as pulse based
(e.g. quantity pulse or relay contacts) transmission procedures. The specified bit rate defines the
maximum bit rate allowed, lower bit rates are always possible.
3.2.3
Modulation
EDS500 series modems rely on FSK based modulation technology with adjustable receiver
amplification and transmitter predistortion to compensate line characteristics. 500FSD20 is able to
report bad line quality via an isolated alarm relay.
3.2.4
Multi-channel
500FSD10 and 500FSD11 are cost-efficient modems allowing to communicate on a 1200 bps
V.23 or 9600 bps channel on one wire pair. The device 500FSD20 is in addition able to operate in
multi-channel environments allowing multiple separate data streams on the same cable. Using this
frequency multiplexing based technology it is possible to separate and run multiple services on a
single two- or four-wire cable. This can also be used to separate the transmit and receive channels
to allow full-duplex on two-wire installations.
12
System concept
1KGT151042 V001 1
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