INSTALLATIONSANVISNING MD-21 AC INSTALLATION MANUAL REV. A MD-21DC INSTALLATIONS ANLEITUNG

Transcription

1 MD- AC MD-DC INSTALLATISANVISNING INSTALLATI MANUAL INSTALLATIS ANLEITUNG Galavanic Isolation -00 Transient Protection CE Approved Westermo Teleindustri AB REV. A Strömslingeomvandlare Current loop converter Stromschleifenwandler

2 Specifications Transmission Asynchronous, full/half duplex or simplex Interface EIA RS--C/CCITT V. -position D-sub female / screw-terminal Interface 0mA current loop, selectable active or passive Data rate Up to 00 bit/s Indicators Power,, Isolation Galvanic isolation with opto-coupler (data transmission) and transformer (supply) Isolation voltage 00V Overvoltage protection Mains: Breakdown voltage 0V at 0V AC and 0V at V AC* Interface : Breakdown voltage transmitter and receiver V. Surge capacity 0. kw for ms Power supply** V*/0V AC +/-0% -Hz Fuse 00mA fast x0mm Power consumption Max VA at V and 0V Temperature range -0 C, ambient temperature Humidity 0-% RH, non-condensing Dimensions x00x mm Weight 0. kg Mounting On a mm DIN-rail ** For other power supply voltages contact Westermo. * Only MD- V -00

3 Settings MD- The MD- can through different switch settings be adapted to a variety of running conditions. To set the switches, open the lid on the top of the plastic case. WARNING! DO NOT OPEN CNECTED UNIT S:- S:- :- PWR RTS CTS DCD DTR DSR SG V/RS--C CNECTI MD-DC V/RS--C CURRENT LOOP CVERTER Inverted Transmitter/Receiver Transmitter Normal Receiver Normal LINE CNECTI R+ R- T+ T- POWER -V DC - + Inverted Normal CTS-control Normal Inverted Always high Inverted : - not used Inverted RTS Receiver active/passive Transmitter active/passive S Passive S Passive S Active S Active Factory settings S S -00

4 Connections MD- Line connection (-Position screw-terminal) Direction No. Description Receiver R+ Receiver R- Transmitter T+ Transmitter T- Shield Power connection (AC) (-position screw-terminal) Screw no. N L * MD- V Power Supply V*/0V AC power PE/Protective Earth Terminal connection (DCE) (RS--C/V., -position D-sub female or screw-terminal) Direction ) Pin no. Screw no. CCITT V. Circuit no. Description I 0 /Transmitted Data O 0 /Received Data I 0 RTS/Request To Send O 0 CTS/Clear To Send O 0 DSR/Data Set Ready & 0 SG/Signal Ground O 0 DCD/Data Carrier Detect NC I=input O=output. MD- is a DCE (Data Communication Equipment). NC=not connected. Line connection MD- MD- Receiver Transmitter Transmitter Shield ) R+ R- T+ T- 0mA current loop equipment T+ T- R+ R- Receiver ) If shielded cable is used, connect the shield only at one end to avoid ground currents. 0-00

5 Transmission range (interface ) Cable Transmission rate bit/s pf/m mm 000 m 000 m 000 m 000 m 00 m 00 m MD- DC Specifications Power supply -V DC Power consumption Max W Isolation 00V Fuse F.A fast x0 mm All other specifications according to MD- Switch settings According to MD- Connections According to MD-, except power supply Screw no. Power Supply Voltage + Voltage -00

6 Connecting the MD- in a 0mA current loop Half duplex transmission Master : on S:, on S: on Slaves : on S:, on S:, on Functional description When transmitting from the master, and flash. flashes on both slaves. When transmitting from a slave both and flash and on the other slaves and the master flashes. Full duplex transmission Master : on S: on S: on Functional description Slaves : on S:, on S:, on When transmitting from a slave the led flashes only on that unit. The led flashes only on the master modem. When transmitting from the master, flash. flashes on both slaves. -00

7 Hints The 0mA current loop interface, or TTY as it is sometimes known, is a popular industrial communications standard. The system relies on a current generator running on both the transmit and receive circuits. On each circuit it is important to have only one current generator supplying current into that circuit. For this reason the MD- can have its current generators set to be either active or passive. It is important to check the state of all attached equipment to ensure correct setting on the MD-. A maximum of devices can be connected in a loop. The RS- interface is configured as DCE (Data Communication Equipment). Most printers, PC s and terminals are set as DTE (Data Terminal Equipment). Some recomendation of cable configurations are given below. If any problems do occur on set up of the MD-, the LED s will be helpful. - PWR: The unit has power. - : Data received on line interface. - : Data received on RS- interface. A good way to check the MD- is to carry out a loop back test. Ensure that either the transmitter or receiver are set to active, but not both active or both passive. Connect T+ to R+ and T- to R-. Connect the RS- interface to a terminal. When keys are pressed on the terminal you should receive the echo on screen. The & lights will both flicker simultaneously as you press the keys. DTE 0 0 DCE 0 0 MD- D-sub MD- D-sub -pol. PC MD- D-sub -00

8 V./RS- Block diagram +VB Line DSR DCD CTS RTS SG D-sub housing PE +V +V F,) R + PWR = R +V 0V -V = +V + OVB 0VB S S +VB ) R R0 0mA 0mA T+ T- R+ R- Shield Power supply Insulated power supply ) 0 Ω resistors R, R-R0 are normally not mounted. ) Metal housing on D-sub is connected to PE if R is mounted. R = R on the DC-mod and R on AC-mod. PE +VB ) OVB R Westermo Teleindustri AB have distributors in several countries, contact us for further information. Westermo Teleindustri AB S-0 0 Stora Sundby, Sweden Phone + 00 Fax info@westermo.se Westermo Web site: Westermo Data Communications Ltd Solent Business Centre Millbrook Road West Millbrook, Southampton SO 0HW Phone: +(0)0-0 Fax.:+(0)0 0 sales@westermo.co.uk Subsidiaries Westermo Data Communications GmbH Bruchsaler Straße, Waghäusel Tel.: +(0)-00-0 Fax.:+(0) westermo.germany@t-online.de TunaTryck AB, Eskilstuna, Sweden