Summary of Contents for Umtech VIDEOBRAIN Expander 2
- Page 1 V id e o B ra in Home Computer Accessory Owner’s Handbook Expander 2 A cce ssory: For best results, read th is b ro c h u re b e fo re u sin g c a rtrid g e...
- Page 3 V i d e o B r a i n EXPANDER 2 OWNER’S HANDBOOK Accessory • Acoustic coupler VideoBrain Com puter Company 2950 Patrick Henry Drive Santa Clara, California 95050 All rights reserved including the right of reproduction in whole or in part in any form. P/N 40-0033 Rev.
- Page 4 Expander 2 Introduction Expander 2 data modems are designed fo r acoustic operation via the switched telephone network or private line installation. Acoustically coupled with most telephone sets, the Expander 2 offers a reliable and convenient method of data transmission. Expander 2 is an originate-only modem for up to 300 baud operation.
- Page 5 Controls and Indicators Following are the controls and indicators found on the coupler. Front Panel 1. Full/Half: this switch sets the duplex (com m unication) mode of the Expander 2 unit. For half duplex operation (local copy back), push the switch in. Full duplex (no copy back) is when the switch is out.
- Page 6 Installation AC Power Connection Expander 2 is provided with a 3-wire power cord which can be connected to any 115 VAC 60 Hz grounded wall outlet. Apply power through this cable. EIA Connection Plug the supplied EIA cable into the 25-pin EIA connector in the back of Expander 1 as shown below.
- Page 7 Expander 2 Location For operation, locate a place for Expander 2 close enough to the telephone so the handset cord can easily reach Expander 2. Avoid places such as on top of a term inal, TV set, air conditioner, etc. Some of this equipm ent can generate electrical or magnetic fields which may cause transm ission errors.
- Page 8 Disconnecting a call When exchanging data with a com puter system, simply sign off from the system and the com puter w ill disconnect your call. At any tim e a disconnect can be accom plished by any of the two parties by removing the handset and putting it back in the cradle on the telephone, thereby disconnecting the line.
- Page 9 Receive Sensitivity: Acoustic mode -4 8 dBm ±3 dB, max hysteresis is 4 dB Transmit Level: Pot a d ju s ta b le - 1 5 t o -2 1 dBm Timings: Carrier detect — on 500 ms ±200 ms off 50 ms ±30 ms Clear to send —...
- Page 10 Interfaces Desig. EIA RS232-C Pin Number Protective Ground Transmit Data Receive Data Clear to Send Data Set Ready Signal Ground Received Line Detector Positive Voltage 9 (test only) Negative Voltage 10 (test only) Data Terminal Ready 20 (optional)
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Page 11: Diagnostic Chart
M aintenance The Expander 2 Acoustic Coupler is designed and manufactured fo r long, trouble-free usage. However, if any problem should occur, the follow ing chart could help the operator to diagnose a problem. D IAGNOSTIC CHART Malfunction: Check: PWR indicator Is the power cord plugged into does not illum inate an active outlet? - Page 12 Expander 2 is used with many exciting VideoBrain cartridges brought to you by the VideoBrain Computer Company. We suggest you try all the VideoBrain Cartridges to help you around the home, educate your children and entertain the whole family. M oney M anagem ent APL/S The Com putational Language* VB-81...
- Page 13 Limited W arranty For 12 m onths from date of purchase, VideoBrain Com puter Company w ill repair free of charge any defect of material and workm anship in the Accessory electronic circuitry. For 90 days from the date of purchase, VideoBrain Com puter Company w ill repair any case or cable defect in material or workm anship in this Accessory free of charge.
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