Black Box ME810 - Manual

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...

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)...

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...

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 ...

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 ...

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...

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...

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...

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...

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....

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.

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