| The asynchronous LT-4V and LH-V line dividers
splitter a V.24-/M-1 modem connection into an
RS485/V.24 interface and a V.24-/M-1 modem interface,
the RS485/V.24 interface being galvanically
insulated from the other interfaces.
For example, this enables several RS485 networks
at some distance from each other to be connected
to a common station via the 4-wire M-1 modem
interface, or enables several addressed input
devices distributed in different buildings with
RS485/V.24 interfaces to be connected to a common
network.
The data flow direction supports any master/slave
networks and Multimaster networks (token passing).
The distance between two LH-4V/LT-4Vís may be
extended as far as 21 km, by means of the modem
interface, the data connection being galvanically
insulated by the optocoupler interfaces. After each
line divider the data are transmitted in regenerated
form. If one device fails, the line splitter is bridged
with relay control, so that the modem connection is
restored without data regeneration. This bypass
function provides a high degree of data protection.
The information contents and protocols are not
influenced by the short device running times.
The transient protection in the line dividers
provides good protection against lightning and overvoltages,
and the galvanic insulation provides
protection where there are differences in potential.
The LT-4V and LH-4V dividers meet the most
stringent requirements regarding reliability, operation
and performance, and their simple handling
enable the devices to be installed without problem.
The LT-4V is integrated in a small, compact tablemounted
casing with its own power supply with an
operating voltage of 230V AC.
The LH-4V is the LT-4V for the 35 mm mounting rail
and operates at a voltage of 24V DC. The signal
status is displayed by means of LEDís (Power, TD, RD
and DCD) on the front panel.
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| Divides a connection into 2 interfaces |
| RS485/V.24 and V.24/M-1 modem interfaces |
| RS485/V.24 interface galvanically insulated |
| Conversion of the RS485 to V.24/M-1 Modem |
| RS485 direction detection: transmit/receive |
| 0-100,000 bits/s, asynchronous |
| 230V AC and 24V DC operating voltage |
| Bypass function |
| Simple installation |
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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 1:
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EIA RS232, V.24/V.28 or 10 mA sym
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| Tristate current loop, 4-wire transfer
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| Interface 2:
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EIA RS232, V.24/V.28 or EIA RS485
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| V.11 (2-wire);
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| Galvanically insulated
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| Schnittstelle X3:
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EIA RS232, V.24/V.28 or 10 mA sym
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| Tristate current loop, 4-wire transfer
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| Transfer speed:
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0-100,000 bits/s, code-transparent
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| Connections:
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LT-4V: All connections as 5-pin plug-in screw terminal
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| LH-4V: Via DIN 41612 connector or via 35 mm support rail assembly base with screw terminals.
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| LED displays:
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Network, TD, RD and DCD (interface 1)
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| Insulation:
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Galvanic insulation of data transfer by optocouplers
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| network insulation by transformer (LT-4V with 230V AC only)
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| Interface 2 Insulated from interface 1 and 3 by optocouplers and protective ground.
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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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| Supply voltage:
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LT-4V: 230V AC + 15%, 50/60 Hz
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| LH-4V: 24V DC + 10%
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| Network cable:
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Detachable, 1.8m (LT-4V only)
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| Current consumption:
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LT-4V: 25 mA maximum
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| LH-4V: 200 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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LH-4V: 129 x 47 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
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| aluminium back
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| Weight:
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LT-4V: 0.5 kg
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| LH-4V: 0,25kg, assembly base add 0.1 kg
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| Assembly:
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LT-4V: Rubber pads or Velcro tape
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| LT-4V: 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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| Range of the M-1 modem interface
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| Range of the RS485 interface
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| Maximum transfer distance 1200m at 0-100,000 bits/s
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| Other model versions
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| LT-1V:
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As LT-4V, all interfaces as V.24/M-1 modem
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| LH-1V:
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LT-1V for 35 mm DIN mounting rail
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| Settings
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| Operating mode of interfaces
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| RS485 line termination
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| Direction of data flow
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