Westermo MA-42 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
6042-2002
www.westermo.se
MA-42 AC
MA-42 DC
©
Westermo Teleindustri AB • 1999 • REV. A
Galvanic
Isolation
Transient
Protection
Balanced
Transmission
CE
Approved
8 6042-2002
Specifications
Transmission Asynchronous, full/half duplex or simplex
Interface 1 EIA RS-232-C/RS-423-A
CCITT V.24/V.10
25-position D-sub female, DCE
Interface 2 EIA RS-422/RS-485/CCITT V.11
Data rate Up to 115,2 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 440V at
230V AC and 220V at 115V AC
Interface 2: Breakdown voltage transmitter
and receiver 7V
Surge capacity 0.6 kW for 1ms
Power supply Switchable 115/230V +15/–10% 48-62Hz
Fuse 100 mA fast 5x20mm
Power consumption Max 25 mA at 230V AC
Temperature range 5–50°C, ambient temperature
Humidity 0–95% RH, non-condensing
Dimensions 161x53x139 mm (WxHxD)
Weight 0.5 kg
Mounting With rubber pads or screws. Screws:
Remove the two "keyholes" on the bottom of the case.
DANGER! DO NOT OPEN CONNECTED UNIT
Switch settings
The MA-42 can through different switch settings be adapted to a variety of running
conditions. To set the switches, open the plastic case by placing and turning a screw-driver between top and bottom at the rear of the case.
12345
V.24/RS-232-C
CONNECTION
LINE
CONNECTION
96042-2002
Transmitter
Factory settings
Transmitter
activated
by
RTS RTS RTS
RTS Always high
DTR DTR
DTR Always high
RTS
DTR
DTR
CTS
Controlled
by
DCD
Controlled
by
S2
S2
S2
S2
S3
ON
123456
ON
123456
ON
123456
Termination (4-wire)
Termination (2-wire)
No termination
S3
S3
S3
Termination
with fail-safe
1)
ON
123456
Always high Always lowAlways active
S2
ON
123456
Always high Always highAlways active
S2
ON
123456
ON
123456
CTS-delay
0ms
S2
S2
20ms
S2
ON
123456
ON
123456
Selection of 2-/4-wire
4-wire
S3
2-wire
S3
ON
123456
ON
123456
ON
123456
S1 Selection of power supply 115V/230V AC
S2 Selection of signal activating the transmitter
Selection of signal controlling DCD
Selection of CTS delay
S3 Selection of termination with fail-safe 1)
Selection of 2- or 4-wire communication
1) 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.
ON
OFF
S3
1 - 6
ON
OFF
S1 S2
1 - 6
ON
123456
ON
123456
ON
123456
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