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
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
– +
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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
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Connections MD-44 AC
Line connection
(5-position screw-terminal)
CCITT V.11
Direction No.
Description Receiver 1 A’ (R+) Receiver 2 B’ (R–) Transmitter 3 A(T+) Transmitter 4 B(T–)
5 Shield
Terminal connection (DCE)
(RS-232-C/V.24/V.28, 9-position D-sub, female)
Line connection
Direction 1) Pin Screw- CCITT V.24 Description
no. terminal Circuit number
I 3 8 103 TD / Transmitted Data
O 2 7 104 RD / Received Data
I 7 6 105 RTS / Request to Send O 8 5 106 CTS / Clear to Send O 6 2 107 DSR / Data Set Ready
5 9 & 1 102 SG / Signal Ground
O 1 4 109 DCD / Data Carrier Detect
I 4 3 108/2 DTR / Data Terminal Ready
1) I = input O = output on MD-44
1) If shielded cable is used, connect the shield only at one end to avoid ground currents.
4-wire
MD-44
RS-422/485 equipment
RS-422/485 equipment
Transmitter/ Receiver
Transmitter/ Receiver
Twisted pairs
Twisted pairs
Receiver
Transmitter
Transmitter
Receiver
A’
B’
A
B
A
B
A’
B’
Shield 1) Shield 1)
A/A’ A/A’ B/B’ B/B’
1
2
3
4
5
3
4
5
MD-44
2-wire
The definations R+/R–,T+/T– can be various between different manufactures.
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MD-44 DC
Specifications
Switch settings
According to MD-44 AC
Power supply 12–36V DC Power consumption Max 1.8W Insulation 1000V Fuse F1 1.6A fast 5x20 mm
I övrigt gäller MD-44 AC specifikationerna
Connections
According to MD-44 AC, except power supply
Connection no. Power supply
1 – Voltage 2 + Voltage 3
Transmission range (interface 2)
Use twisted pair cable. Max transmission range 1200 m (cable specifications 0.3 mm
2
and capacitance 42pF/m). The transmission range will increase if a cable with lower capacitance and larger diameter is used. Use shielded cable in heavy industrial environments.
12 6155-2002
Hints
RS-422/485 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. To get a correct installation according to the RS-422/485 specification it´s very important that the line is terminated at the correct points. The recommendation is to terminate the recei­ver on the master unit and the final bus slave unit. See diagrams for details of how this is done with RS-485 (2-wire) and RS-422 (4-wire).
The line transmitter used in the MD-44 is activated by data received on the RS-232 interface, unlike conventional converters that rely on a control signal (e.g. RTS).
If any problems do occur on set up of the MD-44, the LED’s will be helpful.
• PWR: The unit has power.
• RD: Data received on the RS-422/485 interface.
• DCD: Follows RD in two wire operation. Always active for four wire.
• CTS: Follows RTS.
• RTS: Status of RTS from the RS-232 interface.
• TD: Data received on RS-232 interface.
=Termination
Max 32 connections
Max 1 200 metres
Max 0.3 metre
=Termination
Max 32 connections
A B
ABABAB
A’ B’ A B
B’ A’ A’BBABABAAB’
N.B. R+/R–, T+/T– definitations are not standard, it can help to shift A and B
if the unit does not work.
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OWN COMMENTS
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6155-2002 10.99 TunaTryck AB, Eskilstuna, Sweden
Westermo Teleindustri AB • S-640 40 Stora Sundby, Sweden
Phone +46 16 612 00 Fax +46 16 611 80
E-mail: info@westermo.se • 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.: +49(0)7254-95400-0 • Fax.:+49(0)7254-95400-9 E-Mail: westermo.germany@t-online.de
Westermo Data Communications Ltd Unit 14 Talisman Business Centre • Duncan Road Park Gate, Southampton • SO31 7GA Phone: +44(0)1489 580 585 • Fax.:+44(0)1489 580586 E-Mail: sales@westermo.co.uk • Web: www.westermo.co.uk
Subsidiaries
Block diagram
V.11/RS-422 RS-485V.24/RS-232
X3
TD
RTS
CTS
DCD
DSR
RD
SG
0V
X2
3
A
4
B
3
S3
1
X2
1
A'
2
B'
5
B
Shield
Trig
RTS
CTS
&
TD
+5V
B
Bus termination
0V
B
+5V
B
Bus termination
0V
B
4
S3
2
3
7
8
DCD
1
6
2
5
0V
+5V
J2 1)
RD
0V
Activity
S2
6, 7
+12V
+5V
0V
-12V
PE
Power supply
1) The jumpers J2 and J3 is normally not mounted
F1
Insulated power supply
PE
+5V
B
0V
J3 1)
0V
B
B
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