Page is loading ...
Transmission:
Interface 1:
Interface 2:
Data rate:
Indicators:
Insulation:
Insulation voltage:
Switch settings
The MA-12 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.
MA-12 specifications
Asynchronous, full/half duplex
or simplex
EIA RS-232-C/CCITT V.24/V.28
25-position D-sub female, DCE
±10mA tri-state balanced current
loop
0-38400bit/s
Power, RD, DCD, RTS, TD
Galvanic insulation with
opto-coupler (data transmission)
and transformer (supply)
1500V
Overvoltage
protection:
Power supply:
Fuse:
Power consumption:
Temperature range:
Humidity:
Dimensions:
Weight:
Mounting:
Mains: Breakdown voltage 440V at
230V AC and 220V at 115V AC
Interface 2: Breakdown voltage
transmitter 15V and receiver 5.8V
Surge capacity 0.6kW for 1 ms
Switchable 115/230V +15/-10%
48-62Hz
100mA fast 5x20mm
Max 4VA at 230V
5-50° C, ambient temperature
0-95% RH, non-condensing
161x139x53mm
0.5kg
With rubber pads or screws.
Screws: Remove the two
"keyholes" on the bottom of the case
Selection of signal activating
transmitter (carrier)
Selection of signal controlling CTS
Selection of power supply 115/230V AC
1 2 3 4 5
DANGER! DO NOT OPEN CONNECTED UNIT
V.24/RS-232-C
CONNECTION
LINE
CONNECTION
S1
S2
X
= Switch ON
= Switch OFF
*
= Factory settings
ON
OFF
S2
S1
X
X
7 8
X
Always active
AUX
SRS
RFR
RTS
DTR
DTR and AUX
DTR and SRS
DTR and RFR
DTR and RTS
S1
X
X
X X
X
X
X
1 2 3 4 5
S1
1 - - 9
X
5 6
X
X
X
X
X
X
X
X
X
9
CTS
Controlled by
RTS
Always high
DCD
X
Transmitter (carrier)
activated by
Specifications
Power supply:
Power consumption:
Insulation:
Fuse F1:
All other specifications according to MA-12 AC
Twisted pairs
R+
R-
T+
T-
Transmitter
Receiver
R+
R-
T+
T-
MA-12
Receiver
Transmitter
Shield 1)
1
2
3
4
5
1) I=Input O=Output on MA-12
Direction 1)
Pin
no.
CCITT V.24
Circuit number
Description
I
O
I
O
O
-
O
I
I
I
I
2
3
4
5
6
7
8
11
19
20
25
103
104
105
106
107
102
109
-
120
108/2
133
TD/Transmitted Data
RD/Received Data
RTS/Request To Send
CTS/Clear To Send
DSR/Data Set Ready
SG/Signal Ground
DCD/Data Carrier Detect
AUX/Auxiliary
SRS/Secondary Request To Send
DTR/Data Terminal Ready
RFR/Ready For Receiving
12-36V DC
Max 3W
1000V
1.6A fast 5x20mm
Transmission range (interface 2)
Line connection
(5-Position screw-terminal)
Connections
Terminal connection (DCE)
(RS-232-C/V.24/V.28, 25-Position D-sub, female)
1) If shielded cable is used, connect the shield only at one end to avoid ground currents.
Line connection
MA-12 DC
Switch settings
According to MA-12 AC
Connections
1 2 3 4 5
V.24/RS-232-C
CONNECTION
LINE
CONNECTION
1 2 3
1
2
3
Connection
no
+Voltage
- Voltage
Power
Supply
According to MA-12 AC, except power supply
POWER
12-36VDC
1
2
3
4
5
Receiver
Receiver
Transmitter
Transmitter
Direction
No.
R+
R-
T+
T-
Shield
Description
Cable
42pF/m
0.3mm
Transmission rate bit/s
600
18000m
19200
1000m
9600
2500m
4800
5000m
2400
8000m
1200
12000m
2
i.e MA-12, MA-19 ...
38400
500m
SG
Power supply
1) 0 resistor J2 is normally not mounted.
2) Metal housing on D-sub is connected to 0V
Shield
LineV.24/RS-232
RTS
DTR
DCD
CTS
TD
DSR
PG
Block diagram
7
0V
PE
2
PWR
T+
T-
3
4
6
5
F1
J1
J21)
1
0V
+12V
0V
Volt
sel
115/
230V
Insulated power supply
R+
R-
1
RD DCD
&
RTS
TD
-12V
+12V
2
RD
3
8
+12V
+12V
20
AUX
SRS
RFR
11
19
25
4
5
1
2
3
4
5
6
7
8
9
+12V
X3
2)
S1
Westermo Teleindustri AB, S-640 40 Stora Sundby, Sweden, Phone +46 16 612 00, Fax +46 16 611 80
Westermo Teleindustri AB har återförsäljare i följande länder, kontakta oss för mer
information.
Westermo Teleindustri AB have distributors in following countries, contact us for further
information.
Norway
Finland
Denmark
Austria
Belgium
France
Netherlands
Switzerland
Germany
Great Britain
Italy
/