| The M-1A short-haul modem converts a 4...20 mA
analogue current loop to the digital M-1 modem or
V.24/ RS232 interface. With a M-1A short-haul modem
a 4...20 mA current loop can be extended up to
10 km (2,400 bits/s) to another M-1A. The analogue
values of the current loop are converted by an 8 bit
A/D converter to a binary format, and are transferred
by the M-1 modem or V.24/RS232 interface.
The M-1A may therefore be used both in a current
loop extension and as a simple A-D converter to a
V.24/RS232 interface.
The M-1 modem data transfer is effected via an
interference suppressed symmetrical 10 mA tristate
current loop; both devices are galvanically insulated
from each other. The transient protection in the M-1A
provides good protection against lightning and overvoltages,
and the galvanic insulation provides protection
where there are potential differences.
Because of the conversion to the V24/RS232 interface,
the 4...20 mA current loop can be further extended
by any modem connection.
The M-1A is integrated in a small, compact table
housing, and is provided with its own power supply
for 230V AC and 24V DC The signal status is displayed
by LEDís (Power, TD, RD and DCD) on the front panel.
M-1A meets the most stringent requirements regarding
operating safety, function and power. Because
of its simple handling the device can be installed
without problem.
The Hedin Tex product M-1A can be delivered in a
short time. Your contacts will be pleased to provide
you with information and answer any questions you
may have.
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| 4...20 mA interface extension up to 10,000 m |
| Signal transmission in both directions |
| Conversion of 4...20 mA to V.24/RS232 or M-1 modem |
| Interference suppressed M-1 modem data transfer |
| Galvanic insulation of the devices |
| Transient protection |
| LED displays |
| Small and compact |
| Simple installation |
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| Technical data |
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| Data transfer:
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Asynchronous; full duplex or simplex
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| Interface X1:
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4.20 mA current loop
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| transmitter and receiver (5-pin plug)
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| Input: Resistance 330 ohms
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| In-phase voltage + 25V
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| Output: Maximum current 22 mA
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| Burden 600 ohms
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| Interface X2:
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M-1 compatible interface (10 mA tristate current loop)
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| 2 or 4-wire transfer or
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| RS232/V.24 (5-pin plug)
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| Transfer speed:
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2400 bps, 8 data bits
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| 1 stop bit, no parity.
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| UART format (LSB first)
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| Resolution:
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8 bits, 4800 A/D conversions/s.
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| Error 1% max, with 50 Hz filter
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| Transfer 50 values/s
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| LED displays:
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Network, TD, RD and DCD
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| Insulation:
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Galvanic insulation of data transfer by optocouplers
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| network insulation by
transformer (not 24V DC). The protective
deflector serves to deflect the fault current
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| Transient protection:
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Suppressor diodes and varistors
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| Insulation voltage:
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420 Vrms
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| Supply voltage:
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230V AC±15%, 50/60Hz
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| 24V DC ±10%
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| other voltages on request
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| Current consumption:
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20 mA maximum at 230V AC
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| 90 mA maximum at 24V DC
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| Power cable:
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Detachable, 1.8m (230V AC only)
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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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129 x 47 x 135 (WxHxD)
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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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0,4 kg
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| Assembly:
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Rubber pads or Velcro tape
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| Conformity:
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CE
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| Analogue current loop connection X1 (5-pin screw terminal)
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| Example of application
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