| The repeater extends an RS422/RS485 connection
by a further 1200 m or carries out a 4-/2-wire conversion.
In the case of a 2-wire/2-wire or 4-/2-wire
conversion at any interface the LH-2 detects whether
data are present and switches the transmission direction
of the repeater accordingly. At the same time
the transmitter on the opposite site is switched off,
which means that no additional control lines are
required for reversing direction. In a 4-wire system
the repeater transmits the data regardless of the
direction of transmission. This mode of operation
guarantees short transfer time and protocol independence,
and no speed settings are necessary.
Transfer characteristics such as range are improved
by the use of the LH-2 repeater, and the sub-sections
of a connection are galvanically insulated. A resistance
can be installed at each interface connection
to terminate the end of a sub-section (termination).
The LH-2 repeater is suitable for assembly on a 35
mm DIN mounting rail, and the converter is installed
on the DIN bar by means of an assembly base. This
base consists of a retaining device for the rail and a
screw terminal strip for the interface connections.
The interface converter is placed directly on the
assembly base, contact with the connections being
made automatically. This assembly base guarantees
simple installation and replacement of devices.
The LH-2 is operated with a supply voltage of 24
V DC, and the signal status is displayed by means of
LED’s (Power, RD, TD and DCD) on the front panel.
The transient protection provides good protection
against lightning and overvoltages. The LH-2 meets
the most stringent requirements regarding reliability,
operation and performance, and the device cabe installed
without problem because of its simple handling.
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| Repeater for RS422/RS485 |
| 2-wire or 4-wire transfer |
| RS422 - RS485 conversion |
| Speed 0 - 1 Mbits/s |
| Short transfer time |
| Code-transparent and protocol-independent |
| Galvanic insulation of the interfaces |
| Simple installation on 35 mm DIN rail |
| LED displays |
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| Technical data LH-2 |
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| Data transfer:
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Full-, half duplex or simplex
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| Interface X1:
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EIA-RS422-A/4S485 or 4-wire transfer
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| Interface X2:
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EIA-RS422-A/RS485 or 4-wire transfer
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| Connections:
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All via DIN 41612 connector or 35 mm DIN
rail assembly base with screw terminals
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| Transfer speed:
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0-1 MBit/s;
code-transparent
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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 the data
transfer by optocouplers
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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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24V DC, 17-30V DC
Other voltages on request
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| Current consumption:
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80 mA maximum
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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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47 x 129 x 134 (WxHxD), assembly
base excluded
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| Assembly base: 75 x 100 x 25 (WxHxD)
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| Casing material:
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Plastic ABS, black; aluminium back
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| Weight:
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0.25 kg;
assembly base add 0.1 kg
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| Assembly:
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By assembly base on 35 mm
DIN mounting rail (EN 50022)
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| Conformity:
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CE
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| Settings |
| RS485/RS422 line termination |
| 2-wire or 4-wire transfer |
| Temporary disconnection of the transmitter |
| Temporary extension of the transmitter on status |
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| Range
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| Other model versions
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| LT-2:
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Repeater as table-mounted device
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| LT-2G:
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RS485 repeater with high insulating voltage
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