CrosStar MD-101 & MD-102 Bell 202 and v.23 Modems
The CrosStar MD-101/MD-102 Modem is a half-duplex Frequency-Shift-Keyed (FSK) audio tone modem that connects to SCADA equipment by an RS-232 Data Communications Equipment (DCE) 9-Pin Connector. The MD-101/MD-102 Modem operates from 0 to 1200 baud on private leased telephone lines, voice/audio radio links, or any dedicated two wire circuit. The MD-101/MD-102 has dual isolated audio ports plus a radio Push-To-Talk (PTT) output, so it can operate both telephone and radio circuits simultaneously, providing active audio mixing to prevent impedance mismatching. Both two-wire and four-wire telephone circuits can be interfaced easily to the modems.
The MD-101 Modem uses Bell 202 tones frequencies, while the model MD-102 Modem uses v.23 tones. Both models have four colored LED lights on the front panel displaying the status of the transmitted and received data, carrier-detected, and transmit-on signals. Three connectors on the rear panel provide interconnection for the power input and radio terminals, the phone line modular jack, and the RS-232 DCE connection. The modems have no jumper settings or other set up process. The only inside controls are for the audio level to the radio connector in the event that a radio needs special level adjustments. These controls are factory set to work properly for most radios.
Suggested uses for the MD-101/MD-102 Modem are interfacing SCADA equipment to radio or private leased telephone lines, including SCADA computers and Programmable Logic Controllers (PLC).
Features
Single 12V Power Requirements.
Bell 202 or v.23 models.
ABS plastic enclosure.
Compatible with both Dedicated Telephone lines and Radio Systems.
Easily works with both two-wire and four-wire telephone circuits.
Signal Status lights on front panel.
Simple installation, no jumpers.
Radio audio adjustments provided.
Specifications
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Electrical
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Supply Voltage:
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10 to 24 VDC, 12 V Recommended
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Supply Current:
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40 MilliAmps
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Indicators
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Front Panel:
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Four Status LEDs:
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TX On- Transmit On, Red
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TD- Transmit Data, Green
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CD- Carrier Detected, Yellow
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RD- Received Data, Red
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Communications
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Baud Rate:
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0 to 1200BPS Half-Duplex.
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Tone Frequencies:
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MD-101 (Bell 202) MD-102 (v.23)
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Mark: 1200 Hz 1300 Hz
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Space: 2200 Hz 2100 Hz
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RS-232:
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DB-9F configured as DCE (modem) provides TXD, RXD, RTS, DSR, CTS, & CD Signals.
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Phone Line:
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Two-Wire or Four-Wire, RJ-11 jack.
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Line Level:
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0 dBm, 600 ohms, Matches 150 to 900 ohm Dedicated Telephone Lines.
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Radio Terminal:
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7 pin P1uggable Connector.
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Radio Speaker Input:
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4 to 50 ohm, voltage isolated.
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Radio Mic Output:
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-45 to -8 dBm, Adjustable with Internal Control.
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Radio PTT Output:
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Open Collector 60VDC Transistor, Controlled by RTS.
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Physical
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Size:
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5.5 W x 2.0 H x 5.375 D inches.
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Weight:
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12 oz.
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Temperature:
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0 to 65° C.
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Humidity:
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10 to 90%, Non-condensing.
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Enclosure:
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ABS Plastic Desktop Style, Optional Chassis Mount Available.
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Documents
Made In the United States of America.
© Copyright 1997 - 2003 CrosStar, LLC. All Rights Reserved.
