LH-1V Line splitter

LH-1V LINE SPLITTER
M-1 MODEM
V.24
M-1 MODEM
V.24
M-1 MODEM
V.24
• Divides a V.24/modem connection
into 2 interfaces
• V.24/modem interfaces congurable
• Asynchronous 4-wire data transfer
• Bypass function
• 0-100,000 bits/s, code-transparent
• Galvanic insulation, transient protection
• Mounting rail assembly
• 24V DC operating voltage
The asynchronous LH-1V line splitter executes one
data regeneration within a M-1 modem connection,
and allows simultaneous, isolated data extraction
to a V.24/RS232 or a further M-1 modem interface.
Because of the freely congurable interfaces, the
line splitter can be used not only in modem connections but also as a V.24 interface multiplier or as a V.24
interface in an M-1 modem connection.
Thus, a centre with several addressed ofces may
also communicate over longer distances reliably and
without problem. Furthermore, several addressed
input devices with V.24/RS232 interfaces, distributed
among several buildings, may be combined to form
one common network.
The data ow direction supports any master/slave
and multimaster (token-passing) protocols. The information contents and protocols are not inuenced by
the short device running times of the line splitter.
The distance between two line splitters may be up
to 21 km, because of the 4-wire modem connection,
the data connection being galvanically isolated by
the optocoupler interfaces. The data are transmitted
in regenerated form after each line splitter. In the
event of a power failure the line splitter is bridged
under relay control so that the modem connection
is restored without data regeneration. This bypass
function provides a high degree of data security.
The transient protection in the line splitter provides
effective protection against lightning and overvoltages, and the galvanic insulation provides protection in the case of potential differences.
The LH-1V is designed for 35 mm DIN mounting rail
assembly and operates at an operating voltage of 24V
DC. The line splitter is mounted on the support rail
by means of an assembly base consisting of a retaining device for the rail and a screw terminal strip
for the interface connections and supply voltage.
The devices are plugged directly on to the assembly
base, thereby providing automatic contact with the
connections. This assembly base guarantees simple
installation or device replacement.
The signal status is displayed by means of LED’s
(Power, TD, RD and DCD) on the front panel.
The LH-1V meets the most stringent requirements
regarding reliability, operation and performance,
and because of the simple conguration of the interfaces the device can be installed without problem.
Example of application
V.24
M-1
4
/
0-21 km
LH-1V
0-21 km
4
/
0-21 km
V.24
H-1
LH-1V
0-21 km
V.24
4
/
V.24
LH-1V
Block diagram
Settings
Interface 2
24V+
30
13
V24
Mo
14 12
0V
Signal gnd
29, 16
• Mode of operation of the interfaces
(modem or V.24)
• Direction of data ow
11
V24
Mo
+12 V
Optoisol.
PE
15
VII
Interface 1
4
K1
19
V24 Mo
3
K4
1
VII
K2
0V
Optoisol.
3
DCD
1
18
X9
RD
Optoisol.
K3
X8
1
V24 Mo
K5
V24 Mo
1
2
3
TD
2
1
VII
V24 Mo
LT-1V: Table model with 230V AC or
24V DC supply
LR-1V: LT-1V in European card format for
assembly carrier RV-1
LT-4V: As LT-1V, but only one interface as
V.24/RS485
LH-4V: LT-4V for 35 mm DIN mounting rail
Interface 3
2
17
20
Other model versions
1
K6
+12 V
+12 V
Technical data LH-1V
Data transfer:
Interface X1:
Interface X2:
Interface X3:
Connections:
Transfer speed:
LED displays:
Insulation:
Asynchronous, code-transparent;
full-/ half duplex or simplex
EIA RS232-C, V.24/V.28 or
10 mA tristate current loop (M-1)
EIA RS232-C, V.24/V.28 or
10 mA tristate current loop (M-1)
EIA RS232-C, V.24/V.28 or
10 mA tristate current loop (M-1)
All via DIN 41612 connector or
35 mm support rail assembly base with
screw terminals
0-100000 bits/s
Network, TD, RD and DCD
Galvanic insulation of the data transfer
by optocouplers for M-1 interfaces only
Insulation voltage:
Transient protection:
Supply voltage:
M-1 interface: 420 Vrms
Suppressor diodes and varistors
24V DC + 10%
Other voltages on request
Current consumption: 160 mA maximum
Temperature range:
5-50 °C ambient temperature
Humidity range:
0-95% relative humidity
Dimensions in mm:
47 x 129 x 134 (WxHxD), assembly
base excluded
Assembly base: 75 x 100 x 25 (WxHxD)
Casing material:
Plastic ABS, black; aluminium back
Weight:
0.25 kg; assembly base add 0.1 kg
Assembly:
By assembly base on 35 mm
DIN mounting rail (EN 50022)
Conformity:
CE
Interface signals
Direction
M-1 Modem connection
Description
Direction
Description
R+ receiv er
R- receiv er
If current flow s in receiv er from Rto R+, RD is positiv e
T+ transmitter
T- transmitter
If TD is positiv e, the transmitter
conducts from T- to T+
Input
TD (103)
Transmission data (TD)
Input
Output
RD (104)
Receiv ing data (RD)
Input
Output
Output
+12 V Pullup
SG (102)
Output
Signal ground
Signal ground
M-1 interface range
Cable type 0,3 mm² 42 pF/m
Speed, bits/s
Range, metres
600
1 200
2 400
4 800
9 600
19 200
38 400
64 000
100 000
21 000
15 000
10 000
6 700
4 000
2 500
1 300
800
300
Use pair tw isted, unscreened cables. The transfer characteristics deteriorate as the capacitance increases and the cable crosssection is reduced. Use screened cables in heav y interference env ironment but consider that higher capacitances reduce the
transmission distance.
Example of application
V.24
V.24
LH-1V
X1
V.24
V.24
V.24
M-1 modem
M-1 modem
LH-1V
LH-1V
4-wire connection
4-wire connection
X3
X1
X3
X1
X3
www.hedintex.se
Hedin Tex GmbH Am Herrkamp 14 D-24226 Heikendorf GERMANY Tel +49-431-24 35 91 Fax +49-431-24 57 20
September 1999. We reserve the right to make technical modications. ED000117
RS232/W.24 connection