Westermo MD-44 User Manual
Omvandlare RS-232 – RS-422/485
Converter RS-232 – RS-422/485
RS-232 – RS-422/485 Wandler
INSTALLATIONSANVISNING
INSTALLATION MANUAL
INSTALLATIONS ANLEITUNG
6155-2002
www.westermo.se
MD-44 AC
MD-44 DC
©
Westermo Teleindustri AB • 1999 • REV.A
Galvanic
Isolation
Transient
Protection
Balanced
TransmissionCEApproved
8 6155-2002
Specifications MD-44
Transmission Asynchronous, full/half duplex or simplex
Interface 1 EIA RS-232-C/CCITT V.24/V.28
9-position D-sub female, DCE
Interface 2 EIA RS-422/RS-485/CCITT V.11
Data rate 300 bit/s – 38.4 kbit/s
Indicators Power, RD, DCD, CTS, RTS, TD
Insulation Galvanic insulation with opto-coupler (data transmission)
and transformer (supply)
Insulation voltage 1500V
Overvoltage protection Mains: Breakdown voltage 430V at 230V AC
Interface 2: Breakdown voltage
transmitter and receiver 7V
Surge capacity 0.6 kW for 1ms
Power supply 230V +15/–10% 48–62Hz
Fuse 100 mA fast 5x20 mm
Power consumption Max 22 mA at 230V
Temperature range 5–50°C, ambient temperature
Humidity 0–95% RH, non-condensing
Dimensions 55x100x128 mm (WxHxD)
Weight 0.5 kg AC / 0.25 kg DC
Mounting On DIN-rail 35 mm
Switch settings MD-44
The MD-44 can through different switch settings be adapted to a variety of running
conditions. To set the switches, open the plastic case with e.g. a screw-driver.
Danger! Do not open connected unit
TD RD RTS CTS DCD DTR DSR SG
PWR
1
2
3
4
5
6
7
S3:1-4
S2:1-9
8
9
MD-44 DC
V24/RS-232-C
RS-422/RS-485/V11
CONVERTER
LINE CONNECTION
R+ R-
12 34 5
T+ T-
V24/RS-232-C
CONNECTION
POWER
– +
96155-2002
ON
123456789
ON
1234
Selection of data rate
300
S2
ON
123456789
600
S2
ON
123456789
1200
S2
ON
123456789
2 400
S2
ON
123456789
4 800
S2
ON
123456789
9 600
S2
ON
123456789
19 200
S2
ON
123456789
38 400
S2
ON
123456789
Selection of bits
9
S2
ON
123456789
10
S2
ON
123456789
11
S2
ON
123456789
12
S2
ON
123456789
2/4-wire transmission
Termination with fail-safe *
Factory settings
2-wire
Terminated (4-wire)
S2
ON
123456789
4-wire
S2
S3
ON
1234
Terminated (2-wire)
S3
ON
1234
No termination
S3
ON
1234
S3
* The fail-safe function forces the signal state of
the receiver to OFF when the connected
transmitter is in tri-state (transmitter inactive).
The receiver located furthest away shall be
terminated.
Supervision table when selecting data bits
7 bits
8 bits
No parity
Parity
1 stop bit
2 stop bits
Number of bits 9 10 10 10 11 11 11 12
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
ON
123456789
S2
S2: 8-9 not used.
S2: 8 and 9 not used
Loading...