SIEMENS
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Siemens IK PI · 2015
Industrial Remote Communication
Remote Networks
Modems for the conventional telephone network
MD2 dedicated line modem
7
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Technical specifications
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Ordering data
Article No.
Article No.
Article No.
6NH7810-0AA20
Product-type designation
MD 2 dedicated line modem
Interfaces
• Connection for dedicated line
1 x RJ12
• RS232 connection
for data terminal equipment
1 x 9-pin Sub-D connector
• RS485 connection
for data terminal equipment
1 x 9-pin Sub-D socket
• Connection for supply voltage
1 x 4-pin terminal block
Voltage supply
24 V DC
Current consumption
• from 24 V DC
100 mA
Power loss
2.4 W
Permissible ambient conditions
• Operating temperature
0 °C … +60 °C
• Transport/storage temperature
-40 °C … +70 °C
• Relative humidity
max. 95 % at +25 °C
Design
• Module format
Compact module S7-300,
double width
• Dimensions (W x H x D) in mm
80 x 125 x 120
• Weight
approx. 300 g
Degree of protection
IP20
Transmission path
2-wire, 2 x 2-wire or 4-wire,
twisted pair cable,
non-coil-loaded or lightly coil-loaded
Modulation method
Phase-continuous binary frequency
modulation (FSK)
Data transmission rates
via the dedicated line
1 200 bit/s
2 400 bit/s
9 600 bit/s
(not for leased telephone lines)
19 200 bit/s
(not for leased telephone lines)
Operating mode
• 2-wire or 2 x 2-wire
Half-duplex
• 4-wire
Duplex or half-duplex
Transmission level can be set to
0 dB
-6 dB
-9 dB (for leased telephone lines)
-15 dB
Receiving level
0 … -43 dB
Adjustable terminating resistor
• for 1200 and 2400 bit/s
600 ohms
• for 9600 and 19200 bit/s
150 ohms
• for tapping point
> 6 kOhms
Clear to send
• at 1200 bit/s
after 7 ms
• at 2400 bit/s
after 4 ms
• at 9600 and 19200 bit/s
after 0.5 ms
Minimum/maximum scanning fre-
quency
• at 1200 bit/s
1 300 Hz/2 100 Hz
• at 2400 bit/s
2 400 Hz/3 300 Hz
• at 9600 and 19200 bit/s
20 800 Hz/33 600 Hz
Asynchronous character format
10 or 11 bit
Floating opto-relay output
• Max. supply voltage
60 V AC/DC
• Max. perm. continuous current
400 mA
• Max. R
on
3 ohms
Impulse strength
U
1.2/50
acc. to DIN VDE 0804
between power supply circuit and
• Power supply circuit and
FSK trunk line circuits
2.5 kV
• Power supply circuit and
opto-relay output
2.5 kV
Compatible with SINAUT modems
• MD100
at 1 200 bit/s
• MD124
at 1 200, 2 400 and 19 200 bit/s
Approvals
EU approval CE 0682 X
Article No.
6NH7810-0AA20
Product-type designation
MD 2 dedicated line modem
MD2 dedicated line modem
6NH7810-0AA20
For multi-point connection,
supports tandem stations,
can also be used as a repeater,
max. 19 200 bit/s;
incl. WAN connecting cable
(RJ12/RJ12) for connecting the
modem with an LTOP overvoltage
protection module
Connecting cable
For connecting a TIM
with one of the SINAUT ST7 MD2,
MD3 modems
Cable length 1.5 m
• RS 232
6NH7701-4AL
• RS 485 (not for TIM 3V-IE)
6NH7701-4DL
Accessories
Connecting cable
6NH7701-1CB
For connecting two MD2 modems
(RS 232) in order to create a
repeater;
cable length 0.3 m
Line transformer
with overvoltage protection
•
LTOP1
for 2-wire terminal
6NH9821-0BC11
•
LTOP2
for 4-wire terminal,
2 x 2-wire terminal or
2-wire tandem station
6NH9821-0BC12
Adapters
6NH7760-0AA
For mounting the MD2 modem
on a 35 mm standard mounting rail
SITOP compact 24 V/0.6 A
6EP1331-5BA00
1-phase power supply
with wide-range input
85 … 264 V AC/110 … 300 V DC,
stabilized output voltage 24 V,
rated output current value 0.6 A,
slim design
© Siemens AG 2014