Black Box KV3000 User Manual download pdf (Page 61)

SERVSWITCH™ AND SERVSWITCH ULTRA™

4.4 Using the RS-232 Port

4.4.1 C

ONNECTING

QUIPMENT TO THE

ORT

For your convenience, a computer or terminal with a TIA RS-232 serial port can be

connected to the RS-232 serial port (RJ-12 connector) on the ServSwitch’s rear

panel (see Appendix C for a pinout of this connector). This allows you to send

switching commands from a non-local keyboard rather than from the shared

keyboard, and is also necessary in order to download future firmware upgrades

into the Switch. You’ll need a straight-through-pinned, flat-satin or twisted-pair

serial cable with RJ-12 (“6-pin RJ-11”) connectors plus the appropriate adapter: for

IBM and Sun type PCs and most terminals, either DB25 female to RJ-11 female

(our product code FA044) or DB9 female to RJ-11 female (our product code

FA043), depending on your computer/terminal.

NOTE

Because the serial ports of Apple Macintosh computers use a

proprietary interface with TIA RS-422/423 signal levels rather than

RS-232, a special adapter or interface converter is required to connect

them to the ServSwitch’s RS-232 port (call Black Box for technical

support if you really want to do this). We strongly recommend that you

use some other type of computer to make this connection.

To connect the adapter and cable, take these steps:

1. Connect an adapter of the appropriate type to one of the computer’s (or

terminal’s) serial ports.

2. Plug one end of the cable into the RJ-12 female connector on the adapter,

and the other end into the RS-232 serial port on the ServSwitch’s rear panel.

CAUTION!

Serial cabling in excess of 50 feet (15.2 m) should be routed with

caution. The maximum cable length depends upon the construction of

the cable and its routing. For extended runs, shielded cable should be

used. Avoid routing near fluorescent lights, air-conditioning

compressors, or machines that may create electrical noise. If you

experience a lot of data errors, use shorter cables. The ServSwitch’s

lowest data rate is 9600 bps; it cannot be lowered any further to alleviate

this problem.

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Black Box KV3000 User Manual Page 61