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1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746

© Copyright 2000. Black Box Corporation. All rights reserved.

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Summary of Contents for ME800A

Page 1: ...ree in the U S Call 877 877 BBOX outside U S call 724 746 5500 FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mailing address Black Box Corporation 1000 Park...

Page 2: ...perated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measur...

Page 3: ...bo s tano mojado o cerca de una alberca etc 6 El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante 7 El aparato el ctrico debe ser montado a...

Page 4: ...ontactos y recept culos donde salen del aparato 14 El equipo el ctrico debe ser limpiado nicamente de acuerdo a las recomendaciones del fabricante 15 En caso de existir una antena externa deber ser lo...

Page 5: ...4 SHM B ASYNC TRADEMARKS USED IN THIS MANUAL Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners...

Page 6: ...the table value due to the additional capacitance contributed by the cable s shielding Actual distances may vary depending on your specific operating equipment and the cable you use Protocol Asynchro...

Page 7: ...ment interface EIA 232 Status Indication Two bi color LEDs indicate the status of the transmitter and receiver A green light indicates a low logic level 3 to 25V on the EIA 232 interface a red light i...

Page 8: ...Primary 230 VAC 10 50 60 Hz Secondary 17 VAC 700 mA Size Standalone 1 4 H x 4 25 W x 4 5 D 3 8 x 10 9 x 11 7 cm Rackmount 5 25 H x 17 W x 9 D 13 x 43 x 23 cm Weight Standalone 1 3 lb 0 6 kg including...

Page 9: ...available in both a standalone version ME800A and a rackmount version ME805 C Models ME800A R2 and ME805 C R2 include cables The SHM B is designed to operate over a 4 wire metallic circuit Optimum per...

Page 10: ...ections between two SHM B units NOTE Transmit TX on one modem is wired to Receive RX on the other modem Transmit TX is wired to Receive RX A ground connection is optional 1 If the unit is assembled se...

Page 11: ...e nylon cable tie packaged with the SHM B around the wires Pull the tie tight around the wires to secure them to the printed circuit board Trim the excess nylon tie with wire cutters or scissors Figur...

Page 12: ...nformation on the exact EIA 232 signals required for your equipment Often it is best to use only the Transmit Data TD Receive Data RD and ground lines if your equipment does not require the use of the...

Page 13: ...ails 3 3 Switch Settings Refer to Figure 1 in this chapter Switch S1 is used to reverse the TD and RD lines on the EIA 232 interface This eliminates the need to swap these two lines in your EIA 232 ca...

Page 14: ...Transmitted Data TD To DCE 3 Received Data RD From DCE 4 Request to Send RTS To DCE 5 Clear to Send CTS From DCE 6 Data Set Ready DSR From DCE 7 Signal Ground 8 Received Line Signal Detector From DCE...

Page 15: ...en The twisted pair wires are installed correctly Power is applied to both modems No computer devices are attached to the modems This forces DCD HIGH on the remote modem thus the remote modem knows to...

Page 16: ...R CONTROL JUMPER IN DIS POSITION If X ON X OFF characters are used for handshaking control rather than hardware logic levels move the RTS DTR control jumper to the DIS position Typically units that us...

Page 17: ...rinted circuit board has been completely pushed to the back of the case Connect the SHM B to your equipment then plug the wall transformer into its power source Check the SHM B operation at both ends...

Page 18: ...SHM B transmitter and receiver respectively Green indicates a LOW EIA 232 level and red indicates a HIGH EIA 232 level The LEDs will modulate as data is transmitted and received by the SHM B Remember...

Page 19: ...hen pulling on opposite side plungers to loosen and remove the panel Locate the four 10 32 Phillips head screws that were shipped with the SHM B Rack Use these screws to fasten the SHM B Rack to your...

Page 20: ...you may damage the board and power pins When all boards have been wired and plugged into the rack plug the wall transformer into its power source You should be able to communicate as described in Cha...

Page 21: ...guration and flow control type hardware or software your EIA 232 cable pinouts and what if anything you have already done to correct the situation SYMPTOM LEDs do not light when power transformer is p...

Page 22: ...aneously the RD LED should flash on the other SHM B unit If not go to step 2 2 Inspect the wiring between the two modems Have the wires been properly installed Transmit TX on one modem must be wired t...

Page 23: ...TD and RD LEDs indicate data activity but data communication doesn t exist 1 Check the wiring of the EIA 232 port Refer to Section 3 2 for information 2 Check the setting of S1 Refer to Section 3 3 fo...

Page 24: ...terminal and key in characters look for a good loopback A good loopback verifies a SHM B in proper working condition If you don t have errors you have verified a problem with the twisted pair cable S...

Page 25: ...It may be that the data signal is jumping from the adjacent cable onto the four wire circuit between the two SHM B modems another type of induced signal While you are checking your cable for sources...

Page 26: ...25 SHM B ASYNC SYMPTOM TD or RD indicator is steadily on red with no data attempting to pass no DTEs attached Check for reversal of polarity on the four wire connection...

Page 27: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 2000 Black Box Corporation All rights reserved...

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