| Hedin Tex synchronous short haul modems M-3/R-3
guarantee error free data transmission up to a distance
of 9 kilometres using the RS 232/V.24-interface.
It is a secure extension of your own dataline.
M-3 is a table top version with its own power supply.
R-3 is the corresponding plug-in card for the 19"
rack RV-1, European standard size. Where several
short haul modems are needed, R-3 is used to save
space and to obtain a general overview. It is fully
compatible to M-3.
M-3/R-3 permit rates of up to 64,000 bps with full
duplex, half duplex or simplex. The data transmission
is provided by a tri-state balanced current loop.
This technique of the M-3/R-3 makes it possible to
transfer an additional signal in both directions so
the condition of the lines and the final equipment
can be controlled. On this interface up to 4 M-3/R-3
can be installed on one line (multidrop). The interface
1 is designed according to the standard specifications
EIA RS232-C and CCITT V.24/V.28.
The signal status is shown by five LEDís (POWER,
RD, TD, RTS and DCD) on the front panel. The short
haul modems M-3 and R-3 are codetransparent, i.e.
they are completely independent of data structure
and transmission protocols.
M-3/R-3 offers high protection from lightning and
excess voltage. Not only is the short haul modem
protected but also the connected expensive computer
equipment.
M-3 and R-3 fulfil the highest expectations of operational
reliability, function and performance. Because
of the simple handling the modems are easy
to install and to use. Hedin Tex products M-3 and R-3
are available for prompt delivery.
Your local dealer will be glad to give you more information
and to answer your questions.
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| Synchronous transmission |
| EIA RS232-C, CCITT V.24/V.28 |
| 1200-64000 bps, code independent |
| Full- or half duplex |
| Status signals in both directions |
| Galvanic isolation with opto-coupler |
| Transient protection |
| LED indicators |
| Up to 4 M-3/R-3 at 2 twisted pairs |
| Easy installation |
| Small and compact |
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| Technical data |
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| Data transfer:
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Synchronous, full-/half-duplex or simplex
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| Interface X1:
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EIA RS232-C and CCITT V.24/V.28
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| 25 pin D-SUB connector (female)
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| Interface X2:
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10mA tri-state balanced current loop
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| 2-(simplex) or 4-wire transmission
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| 5 pin connector
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| Transfer speed:
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Synchronous 1200, 2400, 4800, 9600, 19200, 38400, 64000 bps
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| code independent
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| Clock:
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Internal, external
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| RTS/CTS-delay:
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0-80ms in 20ms steps
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| LED displays:
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Power, TD, RD, RTS and DCD
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| Insulation:
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Full electrical insulation: datatransmission with opto-coupler and power supply with transformer.
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| The protective conductor connection is used only for discharging interference voltage
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| Insulation voltage:
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420 Vrms
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| Transient protection:
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Suppressor diodes and varistors
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| Supply voltage:
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M-3: 230V AC 15% 50-60 Hz
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| R-3: 15-17V DC
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| Other voltages on request
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| Power cable:
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1.8 metres, detachable (M-3)
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| Stromverbrauch:
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M-3: max. 15mA
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| R-3 : +15V DC; 160mA
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| Temperature range:
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5-50°C ambient temperature
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| Humidty:
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0-95% relative humidity
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| Dimension in mm:
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M-3: 129 x 47 x 135 (WxHxD)
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| R-3: 100 x 160
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| Weight:
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M-3: 0,4 kg
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| R-3: 0,15 kg
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| Casing material:
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Plastic ABS, black
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| aluminium back
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| Assembly:
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M-3: Rubber pads or Velcro tape
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| R-3: A card slot in the 19î subrack
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| Conformity:
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CE
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| Settings |
| Transmitter controlled by DTR, RTS or always active |
| Termination for receiver |
| RTS/CTS delay 0, 20, 40, 60, 80ms |
| Internal or external clock |
| Transfer speed 1200, 2400, 4800, 9600, 19200, 38400, 64000 bps |
| RS232/V.24 connection (DCE)
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| Range of the modem interface
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| Other model versions
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| M-3X:
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A version of the M-3 with X.21 interface
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| R-3X:
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M-3X in the form of a European-size circuit card
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| M-3XLWL:
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M-3X for fibre-optic cable
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