Westermo MA-42 AC 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 A
MA-42 D
©Westermo Teleindustri AB • 1999 • REV. A
Galvanic
Isolation
Transient
Protection
Balanced
Transmission
CE
Approved

86042-2002
Specifications
Transmission Asynchronous, full/half duplex or simplex
Interface 1 EIA RS- 3 -C/RS-4 3-A
CCITT V. 4/V.10
5-position D-sub female, DCE
Interface 2 EIA RS-4 /RS-485/CCITT V.11
Data rate Up to 115, 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
30V AC and 0V at 115V AC
Interface 2: Breakdown voltage transmitter
and receiver 7V
Surge capacity 0.6 kW for 1ms
Power supply Switchable 115/ 30V +15/–10% 48-6 Hz
Fuse 100 mA fast 5x 0mm
Power consumption Max 5 mA at 30V 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 ONNE TED UNIT
Switch settings
The MA-4 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-dri-
ver 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
TS
ontrolled
by
D D
ontrolled
by
S
S
S
S
S3
ON
1 3456
ON
1 3456
ON
1 3456
Termination (4-wire)
Termination ( -wire)
No termination
S3
S3
S3
Termination
with fail-safe 1)
ON
1 3456
Always high Always lowAlways active
S
ON
1 3456
Always high Always highAlways active
S
ON
1 3456
ON
1 3456
TS-delay
0ms
S
S
0ms
S
ON
1 3456
ON
1 3456
Selection of 2-/4-wire
4-wire
S3
-wire
S3
ON
1 3456
ON
1 3456
ON
1 3456
S1 Selection of power supply 115V/ 30V AC
S 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 - 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.
AAAA
AAAA
AA
AA
AA
AA
ON
OFF
S3
1 - 6 ON
OFF
S1 S2
1 - 6
ON
1 3456
ON
1 3456
ON
1 3456

10 6042-2002
onnections
Line connection
(5-position screw-terminal)
Direction No. CCITT V.11
Description
Receiver 1 A’ R+
Receiver B’ R–
Transmitter 3 A T+
Transmitter 4 B T–
5 Shield
I103 TD/Transmitted Data
O3 104 RD/Received Data
I4 105 RTS/Request To Send
O5 106 CTS/Clear To Send
O6 107 DSR/Data Set Ready
– 7 10 SG/Signal Ground
O8 109 DCD/Data Carrier Detect
10 108/ DTR/Data Terminal Ready
Description
Terminal connection (D E)
(RS- 3 -C/V. 4, 5-Position D-sub, female)
I= Input O= Output on MA-4 .
Direction 1) Pin
no. CCITT V. 4
Circuit number
Line connection
1) If shielded cable is used, connect the shield only at one end to avoid ground currents.
Transmission range (interface 2)
Use twisted pair cable. Max transmission range 1 00m.
(cable specifications 0.3mm and capacitance 4 pF/m).
The transmission range will increase if a cable with lower capacitance and larger
diameter is used.
Use shielded cable in heavy industrial environments.
4-wire -wire
1
3
4
5
3
4
5
A’
B’
A
B
A
B
A’
B’
Receiver
Receiver A/A’
B/B’ B/B’
A/A’
Twisted pairs
Twisted pairs
MA-4 MA-4
Transmitter
Transmitter
RS-4
equipment RS-485 equipment
Transmitter/
Receiver Transmitter/ Receiver
Shield 1) Shield 1)
The definations R+/R–,T+/T– can be
various between different manufactures.

116042-2002
MA-42 D
Specifications
Power supply 1 –36V DC
Power consumption: Max W
Insulation: 1000V
Fuse F1: 1.6A fast 5x 0 mm
All other specifications according to MA-42 AC
Switch settings
According to MA-4 AC
onnections
According to MA-4 AC, except power supply
Connection
no.
Power
Supply
1 + Voltage
– Voltage
3
12345
V.24/RS-232-C
CONNECTION
LINE
CONNECTION
123
POWER
12-36VDC

12 6042-2002
Hints
The MA-4 uses the RS-4 /485 interface.
RS-4 /485 was designed for multidrop applications. When a system is installed it should
form a bus structure (see diagrams). Star shaped networks should never be created,
there are other Westermo products designed to work in star net applications. For
correct installation an RS-4 /485 network should be terminated at the correct points.
The recommendation is to terminate the receivers at both end of network.
See diagrams for details of how this is done with RS-485 ( wire) and RS-4 (4 wire).
On 4 wire systems when the MA-4 is working as a slave, the transmitter is linked to
the same bus as all the other slaves transmitter. A status signal (RTS or DTR) is used to
control the MA-4 ’s transmitter, to ensure that only one slave is active on the bus at the
same time. The status signal is also used to control direction for RS-485 ( wire) trans-
mission.
If any problems do occur on set up of the MA-4 , the LED’s will be helpful.
• PWR: The unit has power.
• RD: Data received on the RS-4 /485 interface.
• DCD: Simulated carrier due to the setting of S .
• CTS: Follows RTS.
• RTS: Indicates that the RS-4 /485 transmitter is activated.
• TD: Data received on the RS- 3 interface.

136042-2002
Max 1 00 metres
Max 3 connections
Max 3 connections
Shortest possible max 0.3 metres
Termination
3
4
4
143143143
343 43
1
3
4
Termination

6042-2002 01.03 TunaTryck AB, Eskilstuna, Sweden
Westermo Teleindustri AB • S-640 40 Stora Sundby, Sweden
Phone [phone] Fax [phone]
E-mail: [email protected] • Westermo Web site: www.westermo.se
Westermo Teleindustri AB have distributors in several countries,
contact us for further information.
Westermo Data Communications GmbH
Bruchsaler Straße 18, 68753 Waghäusel
Tel.: [phone] • Fax.:[phone]
E-Mail: [email protected] • Web: www.westermo.de
Westermo Data Communications Ltd
Unit 14 Talisman Business Centre • Duncan Road
Park Gate, Southampton • SO31 7GA
Phone: [phone] • Fax.:[phone]
E-Mail: [email protected] • Web: www.westermo.co.uk
Subsidiaries
V.11/RS-422
RS-485
V.24/RS-232
Block diagram
SG
Power supply
A'
B'
A
B
Shield
TD
RTS
DTR
DCD
CTS
RD
DSR
PG
2)
70V
PE
1
2
3
4
PWR
TD
+5V
DCD
+5V
2
4
20
8
1
2
3
4
5
RTS
20mS
CTS
RD
5
3
+5V
S3
+5VB
6
1K
100R
1K
S2
6
0VB
5
F1
R44R45
1)
1
PE
1)R46
PE 0VB
0VB
+5VB
0VB
+12V
S2
6
4
S3
3
5
S3
1
2
-12V
0V
+5V
2)
Insulated power supply
1) 0 Ωresistors R45 and R46 are normally not mounted.
2) Metal housing on D-sub is connected to PE.