Westermo LD-34 User Manual
Galvanic
Isolation
4 kanalig RS-232 switch
- RS-232/V.24
4 channel RS-232 switch
- RS-232/V.24
4 Kanal RS-232 Erweiterung
-RS-232/V.24
INSTALLATIONSANVISNING
INSTALLATION MANUAL
INSTALLATIONS ANLEITUNG
6603-2001
www.westermo.se
LD-34 AC
LD-34 DC
©
Westermo Teleindustri AB • 1999 • REV. A
CE
Approved
8 6603-2001
Description LD-34
General
The LD-34 is a 4 channel RS-232 switch. The unit has one input channel that communicates with a selected output channel. A sixth channel called the “Expansion channel”
is provided for onward connection to a modem or another unit. All channels are DCE
connections. RTS, CTS is available on all channels flow control.
Channel selection is made by external signals on the “Digital in” connector or by
raising the RTS signal line.
The front cover has 9 LED's to indicate the state of the various communications paths.
As with all Westermo products the LD-34 provides a high level of galvanic isolation
on the power supply side through transformers and through optocouplers on the inputs.
Channel one and the digital inputs are isolated from channel 2-6.
All operating parameters are set-up via DIP switches located under the lid on the top
of the unit.
The LD-34 is available in both AC (230V) and DC (12-36V) supply voltage.
Digital In
The Digital Inputs, A0,A1,EN, E1 and COM can be used to select the required output
channel. The inputs have a voltage range of 10-30 VDC between A0, A1, EN, E1 and
COM, COM is equivalent to 0V (–). It is possible to reverse the polarity, which means
COM = 10-30 VDC and the inputs are activated by 0V(-) being applied.
The maximum input voltage on the inputs is 30 VDC at a maximum current of
5mA per input. Switching time when channel is less then 0.1 ms.
All digital inputs are galvanic isolated via optocouplers.
RTS control
Raising the RTS signal on channels 2-5 activates this channel. Only one channel can be
activated at a time. If two RTS lines have active, the first gets priority.
96603-2001
Specifications LD-34
Transmission Asynchronous, full/half duplex or simplex
Interface CCITT V.24
Inputs: 9-position D-sub
outputs: 5-position screw block
Isolation AC 3000V, DC 1500V
Data rate 0-115,2 kbit/s
Power supply 230 V AC +15/–10% 48-62 Hz, 12-36V DC
Fuse AC 100mA fast 5x20 mm. DC 1.6 A
Indicators PWR, CH2, CH3, CH4, CH5, TD, RD, RTS, CTS
Power consumption AC 30 mA, DC 1.5W
Temperature range 5-50°C
Humidity 0–95% RH, non-condensing
Dimension 55x100x128 mm (WxHxD)
Weight AC 0.5 kg, DC 0.3 kg
Mounting On 35 mm DIN-rail
LEDs for indication on LD-34
• PWR Indicates that the unit has power
• CH2 Indicates that channel 2 is selected channel
• CH3 Indicates that channel 3 is selected channel
• CH4 Indicates that channel 4 is selected channel
• CH5 Indicates that channel 5 is selected channel
• TD Indicates that the unit is receiving data through channel 1
• RD Indicates that the unit is sending data through channel 1
• RTS Indicates that the unit is receiving RTS signal through channel 1
• CTS Indicates that the unit is sending CTS signal through channel 1
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