Westermo MD-21 User Manual
Strömslingeomvandlare
Current loop converter
Stromschleifenwandler
INSTALLATIONSANVISNING
INSTALLATION MANUAL
INSTALLATIONS ANLEITUNG
6151-2002
www.westermo.se
MD-21 AC
MD-21DC
©
Westermo Teleindustri AB • 1999 REV. A
Galavanic
Isolation
Transient
Protection
CE
Approved
8 6151-2002
Specifications
Transmission Asynchronous, full/half duplex or simplex
Interface 1 EIA RS-232-C/CCITT V.24
9-position D-sub female / screw-terminal
Interface 2 20mA current loop, selectable active or passive
Data rate Up to 19200 bit/s
Indicators Power, RD, TD
Isolation Galvanic isolation with opto-coupler
(data transmission) and transformer (supply)
Isolation voltage 1500V
Overvoltage protection Mains: Breakdown voltage 430V at 230V AC
and 220V at 115V AC*
Interface 2: Breakdown voltage transmitter and
receiver 37V. Surge capacity 0.6 kW for 1 ms
Power supply** 115V*/230V AC +15/-10% 48-62Hz
Fuse 100mA fast 5x20mm
Power consumption Max 4VA at 115V and 230V
Temperature range 5-50° C, ambient temperature
Humidity 0-95% RH, non-condensing
Dimensions 55x100x128 mm
Weight 0.4 kg
Mounting On a 35mm DIN-rail
** For other power supply voltages contact Westermo.
* Only MD-21 115V
96151-2002
Settings MD-21
The MD-21 can through different switch settings be adapted to a variety of running
conditions. To set the switches, open the lid on the top of the plastic case.
WARNING! DO NOT OPEN CONNECTED UNIT
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S4:1-6
S1:1-6S3:1-6
Inverted Transmitter/Receiver
Receiver active/passive
Factory settings
Transmitter
Normal Normal
Normal
Inverted
Inverted
Inverted
Normal
Inverted
Receiver
S1
S1
S1
S1
Passive
S3
Active
S3
S3
Transmitter active/passive
Passive
S4
Active
S4
S4
ON
123456
ON
123456
ON
123456
ON
123456
ON
123456
ON
123456
ON
123456
ON
123456
ON
123456
ON
123456
CTS-control
Always high
S1
S1
RTS
S1
ON
123456
ON
123456
ON
123456
S1: 5-6 not used
TD RDPWR RTS CTS DCD DSRDTR SG
105 106 109 108 107 102
103 104
V24/RS-232-C
CONNECTION
MD-21DC
V24/RS-232-C
CURRENT LOOP
CONVERTER
LINE CONNECTION
R+ R- T+ T-
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POWER
12-36V DC
-+
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