Black Box ME800A - Manuals

Black Box ME800A – Manual in PDF format online.

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Manual

Manual Black Box ME800A

Summary

Page 5 - TRADEMARKS USED IN THIS MANUAL

4 SHM-B ASYNC TRADEMARKS USED IN THIS MANUAL Any trademarks mentioned in this manual areacknowledged to be the property of the trademarkowners.

Page 6 - Asynchronous; Operation —; Balanced current loop Receive lines; Equipment Interface —

5 SHM-B ASYNC 1. Specifications Transmission — Data Rate (bps) Distance (miles/km) 19,200 1/1.6 9600 2/3.2 4800 3/4.8 2400 4/6.4 NOTE: The above specifications are valid for 24- or 26-AWG unshielded twisted-pair telephone cable insulated by polyethylene with amutual capacitance of 0.083 µf/mile. Shi...

Page 10 - Strip each of the four wires about

9 SHM-B ASYNC 3. Installation Installation involves three basic steps: four-wireconnections; EIA-232 connection; switch settings. 3.1 Four-Wire Connections Figure 1 shows the location of the terminal block on thecircuit board. Refer to Figure 2 to make the properconnections between two SHM-B units. ...

Page 14 - NOTE

13 SHM-B ASYNC information concerning its DTE/DCE setting. Table 2gives the EIA-232 pinning of the SHM-B with theDTE/DCE switch in the DCE position. Table 2. Pinning with DTE/DCE switch in the DCE position. PIN NUMBER SIGNAL NAME DIRECTION 1 Protective Ground ————— 2 Transmitted Data TD* To DCE 3 Re...

Page 15 - EN P; • The twisted-pair wires are installed correctly.

14 SHM-B ASYNC 3.4 Flow Control The SHM-B uses a clever, yet simple way to allow thisunit to work with a broad line of equipment. S TANDARD EIA-232C H ANDSHAKING (RTS/DTR C ONTROL J UMPER IN EN P OSITION ) The individual SHM-B modems force their own DTR,RTS, CTS, and DSR control lines HIGH (>+3V)...

Page 16 - DIS P

15 SHM-B ASYNC Because DTR, DSR, RTS, and CTS are tied togetherinternally, dropping any one of these four signals to anegative state will also drop DCD on the remote side to anegative state. DCD will also go LOW if the remoteSHM-B is powered down, or if the twisted-pair wire isbroken. X-ON/X-OFF M O...

Page 17 - Figure 3. Activating the LOOPBACK switch.

16 SHM-B ASYNC 4. Operation After completing the wiring and configurationprocedure, slide the printed circuit card back into thecase while pulling the data and power cables throughthe holes in the back panel. The front panel will snapinto the front of the case when the printed circuit boardhas been ...

Page 19 - Rackmount Installation; CAUTION

18 SHM-B ASYNC 5. Rackmount Installation The SHM-B Async Card is a rack mount unit (ME805-C)that installs in a standard 19-inch panel rack. (You canuse the SHM-B Rack [ME810], which can hold up to 16cards.) The SHM-B Async Card will occupy 5.25 inchesof vertical rack space, and is 9 inches deep. To ...

Page 20 - Chapter 4; . When all channels are operating, attach the

19 SHM-B ASYNC easiest access to the terminals, switches, etc. After a SHM-B Card is wired, it can then be inserted intoan open slot in the SHM-B rack. Be certain that the circuit board has mated with the power pins on the SHM-B rack beforeapplying force to fully seat the board ; otherwise you may d...

Page 21 - Troubleshooting Guide; LEDs do not light when power transformer

20 SHM-B ASYNC 6. Troubleshooting Guide The following information will help you troubleshootyour installation if problems develop. If your particularsituation isn’t listed here, call Technical Support forassistance. Have ready a description of the problem withyour installation, your DTE equipment ma...

Page 22 - Check the EIA-232 interface using a breakout box.

21 SHM-B ASYNC printed circuit board is properly inserted and fullyseated against the motherboard of the rack. SYMPTOM: No data transfer in one or both directions (to, from, or to-and-from the SHM-B). 1. Monitor the TD LED on the sending-end modem while sending data. The light should flash red/green...

Page 23 - Section

22 SHM-B ASYNC Pins 4, 5, 6, 8, and 20 should all be HIGH to enablecommunication. 5. If pin 8 (Carrier Detect) is low, this indicates: • a defective transmission line or connection • a defective remote SHM-B • remote SHM-B without power SYMPTOM: TD and RD LEDs indicate data activity, but data commun...

Page 24 - Chapter 1

23 SHM-B ASYNC computing equipment for consistency. 3. Wire the SHM-B units back-to-back, eliminating the twisted-pair; see if you still have errors. • If you do have errors, then test each SHM individually in the following way: loopback oneSHM’s Transmit-to-Receive by using two shortpieces of wire....

Page 26 - TD or RD indicator is steadily on red with

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-wireconnection.