| The Hedin Tex asynchronous interface converters
M-4/R-4 guarantee an error free data transmission
up to a distance of 1,2 kilometres using the RS232/
V.24-interface.
M-4 is the table top version with its own power
supply. R-4 is the corresponding converter in form of
a plug-in card for the 19" rack RV-1 with European
standard size. Where several converters are needed,
R-4 is used to save space and to obtain a general
overview. It is fully compatible to M-4. M-4/R-4 permits
rates of up to 100,000 bps with full duplex, half
duplex or simplex. The data transmission is provided
by the V.11, RS-422, RS485-interface. This
technique makes it possible to connect up to 32
M-4/R-4 to the same local data network line.
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 four LEDís
(POWER, RD, TD and RTS) on the front panel. Transmission
of data is full duplex with two twisted pairs
of cable, half duplex or simplex with one twisted
pair. Using one pair of cables the transmission is directed
through the V.24/RS232-C by the signal RTS
(150) or the V.24 data. The converters M-4 and R-4
are codetransparent which means they are completely
independent from data structure and transmission
protocols.
M-4/R-4 offer high protection from lightning and
excess voltage. Not only the converter is protected
but also the connected expensive computer equipment.
M-4 and R-4 fulfil the highest expectations of operational
reliability, function and performance. Because
of the simple handling the modems are easy
to install and to use. The Hedin Tex products M-4 and
R-4 are available for prompt delivery. Your local
dealer will be glad to give more information and to
answer your questions.
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| Asynchronous transmission |
| EIA RS232-C, CCITT V.24/V.28 |
| V.11/RS-422/RS-485 |
| Full duplex or half duplex |
| 0-100,000 bps, code independent |
| Distances up to 1200 metres |
| Galvanic isolation with opto-coupler |
| Transient protection |
| LED indicators |
| Up to 32 M-4/R-4 on the same bus |
| Easy installation |
| Small and compact |
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| Technical data |
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| Data transfer:
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Asynchronous; 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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EIA RS422/RS485 and V.11 2- or 4-wire transmission, transmitter or reveiver terminated, 5 pin connector
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| Speed:
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Asynchronous 0-100,000 bps
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| LED displays:
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Power, TD, RD and RTS
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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-4: 230V AC 15% 50/60 Hz
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| R-4: 15-17V DC
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| Other voltages on request
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| Power cable:
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1.8 metres, removable (M-4)
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| Current consumption:
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M-4: 15mA at 230V AC
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| R-4: 120mA at 15V DC
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| Temperature range:
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5-50°C ambient temperature
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| Humidity range:
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0-95% relative humidity
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| Dimensions in mm:
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M-4: 129 x 47 x 134 (WxHxD)
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| R-4: 100 x 160
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| Casing material:
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Plastic ABS, black
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| aluminium back
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| Weight:
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M-4: 0.4 kg
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| R-4: 0,1 kg
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| Assembly:
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M-4: Rubber pads or Velcro tape
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| R-4: a card slot in the 19î RV-1 subrack
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| Conformity:
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CE
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| Settings |
| 2- or 4-wire transmission |
| Termination of receiver or transmitter |
| Transmit/receive controlled by RTS or data |
| V.24 connection (DCE)
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| Transmission range interface 2
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| Maximum transfer distance 1,200 metres at 0 - 100,000 bps. Use pair twisted, unscreened cables. The transfer characteristics deteriorate as the capacitance increases and the cable crosssection is reduced. Use screened cables in heavy interference environment but consider that higher capacitances reduce the transmission distance.
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| Other model versions
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| H-4:
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A version of M-4 for the 35 mm DIN mounting rail
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| LT-2:
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RS485/RS422- line repeater
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| LH-2:
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A version of LT-2 for the 35 mm DIN mounting rail
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| LT-2G:
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RS485 line repeater with galvanic insulation
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| Example of application
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