Hitachi EDS500 Series User manual

Operating instruction
Modem 1200 baud 500FSD10
EDS500 series - FSK modems
Application, characteristics and technical data have to be
taken from the hardware data sheet:
500FSD10 Data sheet 1KGT150982
Operation
The 500FSD10 modem is a voice-frequency
telegraphy unit (VFT unit) according to CCITT V.23
recommendationwhich operates according to the principle
of binary frequency shift keying (FSK). The modem can
operate in two- and four-wire connection. The mode of
operation is set by means of a twelve-fold DIP-switch.
Connections
Power connector (X1)
The EDS500 devices are equipped with a wide range
power supply for voltages between 24 and 60 Volts DC
(power consumption see device label). The connector is a
3-pin Phoenix plug with screw terminals.
Pin allocation power supply (X1)
Pin Signal
1 24-60 V DC
2 Functional earth
1 2 3
3 GND
ADVICE
Due to the internal overvoltage protection, interrupt
any connection to ground of the device for the time
of the measurement before you carry out isolation
measurements. This includes the earthing of the hat
rail as well as all shields of all transmission lines and
supply feedings. RJ-12 plugs or RJ-45 plugs can also
establish earthing via the shield.
Serial interface to DTE (X2)
The RJ-45 connector X2 forms an RS-232-D interface. If
the modem is connected to an RTU, an adapter cable has
to be used which connects the pin pairs.
Pin allocation serial interface DTE (RJ-45)
RS-232-D
Pin Signal
V.24
Signal
V.28
Direction
1 DSR M1 107 output
2 DCD M5 109 output
3 DTR S1 108.2 input
4 GND GND -
5 RxD C2 104 output
6 TxD D1 103 input
7 CTS M2 106 output
8 1
8 RTS S2 105 input
Interface to transmission line (X3)
In two-wire mode X3-1 and X3-2 form terminal NF1 which
is used for transmission and reception.
In four-wire mode X3-1 and X3-2 form the transmitter
terminal NF1 and X3-3 and X3-4 form the receiver pair
NF2.
NF terminals
Transmit Receive
2-wire NF1: X3-1 and X3-2 NF1: X3-1 and X3-2
4-wire NF1: X3-1 and X3-2 NF2: X3-3 and X3-4
Pin allocation transmission line interface (X3)
Pin Signal
1 NF1a
2 NF1b
3 NF2a
4321
4 NF2b
Signaling
LED Description Function
off Device is without
power supply
Power Voltage
Supply
green Power supply
switched on
off DTE does not sendRTS Request to
send green DTE requests
to send via the
modem

LED Description Function
off CTS inactiveCTS Clear to send
green The CTS is
switched on when
the carrier is being
established. A
transmit delay time
of 20-30ms has to
be adjusted in DTE
settings.
off No signal receivedDCD Data carrier
detected green Modem signal
received
Settings
The DIP-switch S1 establishes the mode of operation of
the modem.
Switch C-1 is reserved for future use.
Switch C-2 establishes a permanent carrier on the line
which is useful in a four-wire fullduplex connection.
Switch 2-W distinguishes between two-wire and four-
wire operation of the modem. In two-wire mode X3-1 and
X3-2 form terminal NF1 which is used for transmission
and reception. In four-wire mode X3-1 and X3-2 form
the transmitter terminal NF1 and X3-3 and X3-4 form the
receiver pair NF2.
The next three switches belong to the transmitter
amplitude. In a long multi-drop line configuration, where
the modem in the central needs a high amplification factor
to receive the signal of the last modem, the transmission
level of the modem next to the central station can be
reduced by 20 dB with the –20dB switch. This is done
to avoid overdrive of the receiver in the central station
modem. To compensate a low-pass character of the
transmission line, the amplitude of the upper transmission
frequency can be increased by 20 %, 40 % and 60 %. If
both switches 20% and 40% are ‘off’, no increasing of the
amplitude takes place.
The 500FSD10 has five predefined receiver amplifications:
0 dB, 10 dB, 20 dB, 30 dB and 40 dB. These are set by
the switches 10dB to 40dB. Only one amplification DIP
switch is allowed to be in the 'on' position at a time.
If the 500FSD10 is to be terminated with the line
impedance, the DIP switches T-T and T-R need to be
switched to 'on'. This is usually the case at both ends of
the line. If the modem is to be connected in a party-line
manner in between, these DIP switches have to be ’off’.
T-T terminates the low frequency (LF) line NF1, which
is formed by terminals X3-1 and X3-2. T-R terminates
the receiver pair NF2 of the four-wire configuration with
terminals X3-3 and X3-4.
left – ‘off’ right – ‘on’
C-1 for future use for future use
C-2 switch on sender
with RTS
carrier always
active (four-wire)
2-W four-wire mode two-wire mode
-20dB normal sending
power
decrease sending
power by 20 dB
left – ‘off’ right – ‘on’
20% raise upper
frequency
amplitude by 20 %
40%
both raising
factors active:
60 % of upper
frequency
amplitude, none
active: no raise
raise upper
frequency
amplitude by 40 %
10db 10 dB amplification
20db 20 dB amplification
30db 30 dB amplification
40db
only one factor
allowed to be
active, all off: 0 dB
40 dB amplification
T-T no termination
NF1 (> 6 kΩ)
line termination
NF1
T-R no termination
NF2 (> 6 kΩ)
line termination
NF2
Safety
DANGER
Interrupt the power supply before mounting or
dismounting the device.
WARNING
An easy to access manual interrupter has to be
installed into the power feed of the modem to be able
to disconnect the modem from the power supply in the
case of an emergency.
WARNING
The EDS500 devices are intended only for use in
restricted access area. For fire protection the devices
have to be mounted into suitable cubicles which are
certified for the function of a fire protection housing.
WARNING
The DC power supply has to fulfil the following
requirements in order to supply appropriate fire
protection:
•Limited power source according to IEC 60950-1 or
PS2 classified according to IEC 62368-1
•Short-circuit current < 8A
WARNING
The device shall be powered off while accessing any
of the connectors X1 (power connector) or X4 (alarm
relay). Any other connectors (e.g. RS-232 or 4-wire/2-
wire communication port/X3) are hot-pluggable while
the device is operating.
WARNING
No plug shall be freely accessible in normal operation
due to safety reasons.

Installation
ADVICE
The EDS500 devices are protection class II
devices with functional earthing.
Correct functional earthing is accomplished
by snapping the modem on the properly
earthed DIN-rail (making contact to
backside functional earth contacts) and
additionally connecting terminal X1-2
(SHIELD) to an earthing terminal on the
DIN-rail.
WARNING
Functional earthing must be done properly
in order for the overvoltage protection of the
modem to work properly.
"Fig. 4: Schematic installation drawing" shows a schematic
drawing of the correct installation of the modem. X1-2 has
to be connected to functional earth.
Terminal X1-1 is connected to the positive terminal and
X1-3 to the negative terminal of a DC power supply.
The communication line can be either connected in two-
wire or four-wire configuration. For two-wire configuration
connect terminal X3-1 and X3-2 to the pair of wires. For
four-wire configuration connect terminal X3-1 and X3-2 to
the pair of wires used for transmit direction and X3-3 and
X3-4 to the pair used for receive direction.
The internal transformers of the 500FSD10 have
a galvanic isolation of 3 kV. If a higher level of
protection is needed, additional isolation low-frequency
(LF) transformers have to be used. See "Fig. 5:
Communication line connection by LF transformer
(two-wire connection)" and "Fig. 6: Communication line
connection by LF transformer (four-wire connection)" for
the installation scheme.
Finally, the serial interface has to be connected to the local
data termination equipment (DTE) by connecting X2 of the
500FSD10 to the serial interface of the DTE by a shielded
serial cable, e.g. 500CAB08.
Other Indication Symbols
The following other indication symbols are used on
EDS500 series devices:
Symbol Type Meaning
Conformity The CE mark on a product indicates
that the manufacturer or importer of
that product affirms its compliance with
the relevant EU legislation and the
product may be sold anywhere in the
European Economic Area (EEA).
Conformity According to directive 2012/19/
EU of the European Parliament
and of the Council of 4 July 2012
on waste electrical and electronic
equipment (WEEE), used electrical
and electronics devices shall no more
be disposed to unsorted waste. The
symbol of the waste bin on wheels
shows the necessity to separately
collect electronics waste. Therefore,
this equipment should be disposed
through the designated systems of
waste sorting if it is no longer used.
Table 1: Other indication symbols on EDS500 series
devices

Figure 1: 500FSD10 Figure 2: 500FSD10 Front plate
Figure 3: 500FSD10
Label
X1
X3
X2
1 2 3
1 2 3 4
Connect DIN
-rail to
protection
earth
Figure 4: Schematic installation drawing
NF2a
NF2b
NF1a
NF1b
500LTD01
two-wire-
transmission line
Receive
ZL
ZL
ZI
Transmit
Figure 5: Communication line connection by LF transformer (two-wire connection)

Receive
Transmit
ZL
NF2a
NF2b
NF1a
NF1b
four-wire-
transmission line
ZL
ZI
500LTD01
500LTD01
Figure 6: Communication line connection by LF transformer (four-wire connection)
Hitachi Energy Germany AG
P.O. Box 42 01 30
68280 Mannheim, Germany
hitachienergy.com/eds500
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1KGT150983 V001 1