Manual
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 CCITT V.23 modem for
snap-in DIN-rail mounting. V.23 operates with the
frequency shift keying method (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 for compact devices (X1)
The EDS500 series devices are equipped with a wide
range power supply for voltages between 24 and
60 Volts (power consumption see device label). The
connector is a 3-pin Phoenix plug with screw terminals.
Pin allocation power supply
Pin Signal
1 VIN+ (24-60 VDC)
2 Shield connected to functional earth
1 2 3
3 VIN-
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 measurement. 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 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 a terminal unit, 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
8 1
2 DCD M5 109 output
Pin allocation serial interface DTE (RJ-45)
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 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
4 3 2 1
4 NF2b
Signaling
LED Description Function
off Device is without
power supply
Power Voltage
Supply
green Power supply
switched on
off DTE does not
send
RTS 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
green Signal received
from DTE
Settings
The DIP-switch S1 establishes the mode of operation
of the modem.
Switch C-1 is reserved for future use. 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
left – ‘off’ right – ‘on’
-20dB normal sending
power
decrease sending
power by 20 dB
20% both raising
factors active: 60
%
raise upper
frequency
amplitude by 20
%
40% of upper
frequency
amplitude, none
active: no raise
raise upper
frequency
amplitude by 40
%
10db 10 dB amplifi-
cation
20db 20 dB amplifi-
cation
30db 30 dB amplifi-
cation
40db
only one factor
allowed to be
active, all off: 0
dB
40 dB amplifi-
cation
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 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
No plug shall be freely accessible in normal
operation due to safety reasons.
Installation
ADVICE
The 500FSD10 modem is a protection class II device
with functional earthing.
Functional earthing must be done properly in order
for the overvoltage protection of the modem to
work properly.
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.
"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, 500CAB09.
Figure 1: 560FSD10
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
1
.
.
.
8
Figure 4: Schematic installation drawing
NF2a
NF2b
NF1a
NF1b
Z
0
Z
0
A1 A1
E1 E1
A2 A2
E2 E2
S
P
T-T
T-R
NF1
NF2
OVP
OVP
Figure 5: Communication line connection by LF transformer (two-wire connection)
NF2a
NF2b
NF1a
NF1b
Z
0
Z
0
A1 A1
E1 E1
A2 A2
E2 E2
S
P
A1 A1
E1 E1
A2 A2
E2 E2
S
P
T-T
T-R
NF2
NF1
Receive
Transmit
LF signal transformer
OVP
OVP
Figure 6: Communication line connection by LF transformer (four-wire connection)
1KGT150983 V000 1
ABB AG
Power Grids
P.O. Box 10 03 51
68128 Mannheim, Germany
Tel. +49 621 381-3000
www.abb.com/remote-terminal-units
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