Westermo MD-54 User Manual
CTS-generator,
Xon/Xoff till CTS-omvandlare
CTS-generator,
Xon/Xoff to CTS converter
CTS-Generator,
Xon/Xoff auf CTS Wandler
INSTALLATIONSANVISNING
INSTALLATION MANUAL
INSTALLATIONS ANLEITUNG
6605-2001
www.westermo.se
MD-54 AC
MD-54 DC
©
Westermo Teleindustri AB • 1999 • REV. A
Galvanic
Isolation
Transient
Protection
Balanced
TransmissionCEApproved
136605-2001
Specifications MD-54
Transmission Asynchronous, full/half duplex or simplex
Interface Channel 3: RS-232/V.24: 5-pin screw terminal
Channel 0: RS-232/V.24: 9-pin D-sub
RS-422/485: 5-pin screw terminal
Transmission rate Channel 3: 300–115 200 bit/s
Channel 0: RS-232/V.24: 1 200–115 200 bit/s
RS-422/485: 1 200–460 800 bit/s
Buffer Channel 3: 16 kb
Channel 0: 16 kb
Power supply 230V AC +15%/–10% 48–62 Hz, 12–36V DC
Isolation voltage 3000V AC, 1500V DC
Fuse AC 100mA fast 5x20 mm, DC 1.6A
LED Indicators PWR, RD0, TD0, L1, L2, L3, L4, L5, L6, L7, L8
Power consumption AC 30 mA, DC 1.5W
Temperature range 5–50°C, ambient temperature
Humidity 0–95% RH non-condensing
Dimension 55x100x128 mm (WxHxD)
Weight AC 0.5 kg, DC 0.3 kg
Mounting 35 mm DIN-rail
Description MD-54
The MD-54 is a device that solves serial data incompatibility problems between two
devices. For example it can be used as a ’CTS-generator’ or a ’XON/XOFF to RTS/CTSconverter’. It can also be used as a parameter and/or speed-converter and data buffer.
The unit is set up using a terminal or PC and settings are stored in non volatile memory.
The unit consists of two RS-232/V.24 interfaces and two 16 kb data buffers, one in
each direction. There is also a RS-422/485 interface connected in parallel to one of the
RS-232/V.24 interfaces. Both RS-232/V.24 interfaces are DCE connections.
The front cover has 11 LED’s for status indication.
As with other Westermo products the MD-54 provides a high level of galvanic isolation both on power and inputs. Operating modes are set-up via DIP-switches located
under the lid on the top of the unit. The MD-54 is available in both AC (230V) and DC
(12–36V) supply voltage. The unit is designed for mounting on 35 mm DIN-rail.
14 6605-2001
Switch settings MD-54
The MD-54 can be set for a range of different operating conditions. Some settings are
made via DIP-switches located under the lid on the top of the unit.
ON
12345678
ON
123456
5
4
3
2
1
5
4
3
2
1
1
2
3
4
5
1234 5 123 45
Warning! Do not open
connected unit
Function switch 1
Normal function
S1
ON
12345678
New program can
be downloaded
via channel 0 *
S1
ON
12345678
Settings can be made
via channel 0 **
S1
Function switch 2
Termination 4-wire (RS-422)
S2
ON
123456
Termination 2-wire (RS-485)
S2
ON
123456
No termination
S2
ON
123456
Function switch 2
Factory settings
4-wire (RS-422)
S2
ON
12345678
S1
ON
123456
S2
ON
123456
2-wire (RS-485)
S2
*) The unit will automatically adapt its communication
parameters for channel 0.
PC based software from Westermo is required to download a new program.
**) In this setting channel 0 communicates as follow:
– 9 600 bit/s
– 8 bits wordlength
– no parity
– 1 stop bit
156605-2001
Designation Description
PWR Power supply OK
RD0 RD signal channel 0
TD0 TD signal channel 0
L1 RTS signal channel 0
L2 –
L3 CTS signal channel 3
L4 –
L5 RD signal channel 3
L6 TD signal channel 3
L7 RTS signal channel 3
L8 –
Connections MD-54
Direction Connection CCIT V.11
no. Description
Receiver 1 A’ (R+)
Receiver 2 B’ (R–)
Transmitter 3 A (T+)
Transmitter 4 B (T–)
5 Shield
Connection channel 0, RS-422/485 LED’s description
Direction Connection CCITT V.24
Signal description
DCE 9-pos D-sub Description
O 2 104 RD/Received Data
I 3 103 TD/Transmitted Data
– 5 102 SG/Signal Ground
I 7 105 RTS/Request To Send
O 8 106 CTS/Clear To Send
I = Input MD-54 O = Output MD-54
Connection channel 0, RS-232/V.24
Direction Connection CCITT V.24
Signal description
DCE no. Description
I 1 103 TD/Transmitted Data
O 2 104 RD/Received Data
I 3 105 RTS/Request To Send
O 4 106 CTS/Clear To Send
– 5 102 SG/Signal Ground
I = Input MD-54 O = Output MD-54
Connection channel 3, RS-232/V.24
Digital In, channel 1, 2 and 4 not used.
The definations R+/R–, T+/T– can be various between
different manufactures.
Loading...