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Summary of Contents for Westermo MD-21 AC
- Page 1 (217) 352-9330 | Click HERE Find the Westermo MD-21-DC at our website:...
- Page 2 INSTALLATIONSANVISNING INSTALLATION MANUAL INSTALLATIONS ANLEITUNG 6151-2002 Galavanic Transient Isolation Protection Approved Strömslingeomvandlare Current loop converter Stromschleifenwandler www.westermo.se...
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Page 3: Specifications
Max 4VA at 115V and 230V Temperature range 5-50° C, ambient temperature Humidity 0-95% RH, non-condensing Dimensions 55x100x128 mm Weight 0.4 kg Mounting On a 35mm DIN-rail ** For other power supply voltages contact Westermo. * Only MD-21 115V 6151-2002... - Page 4 Settings MD-21 The MD-21 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 CONNECTED UNIT TD RD RTS CTS DCD 103 104 105 106 109 108 107 102 V24/RS-232-C...
- Page 5 Connections MD-21 Power connection (AC) Line connection (5-Position screw-terminal) (3-position screw-terminal) Power Screw Direction Description Supply Receiver 115V*/230V AC power Receiver Transmitter PE/Protective Earth Transmitter Shield * MD-21 115V Terminal connection (DCE) (RS-232-C/V.24, 9-position D-sub female or screw-terminal) Direction 1) Pin Screw CCITT V.24 Description...
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Page 6: Switch Settings
Transmission range (interface 2) Transmission rate bit/s Cable 42pF/m 1200 2400 4800 9600 19200 0.3 mm 6000 m 5000 m 4000 m 3000 m 500 m 200 m MD-21 DC Specifications Power supply 12-36V DC Power consumption Max 3W Isolation 500V Fuse F1 1.6A fast 5x20 mm... - Page 7 Connecting the MD-21 in a 20mA current loop Half duplex transmission Master S1: 3 on S3: 1, 2 on S4: 3–6 on Slaves S1: 3 on S3: 1, 2 on S4: 1, 2 on Functional description When transmitting from the master, RD and TD flash. RD flashes on both slaves. When transmitting from a slave both RD and TD flash and on the other slaves and the master RD flashes.
- Page 8 Hints MD-21 D-sub The 20mA current loop interface, or TTY as it is sometimes known, is a popular industrial communications standard. The system relies on a cur- rent generator running on both the transmit and receive circuits. On each circuit it is important to have only one current generator supplying cur- rent into that circuit.
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Page 9: Block Diagram
R = R3 on the DC-mod and R1 on AC-mod. Westermo Teleindustri AB have distributors in several countries, contact us for further information. 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...
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