Oh boy! Just so this mis-information stops here, the original RS-232 spec was for 20,000bits/second at 50ft. So at several hundred feet I assume you prefer 2400 baud for some reason.
Maximum Data Rate (bps) Maximum Length) 2,400 (2.4K) 120m (400ft) 4,800 (4.8K) 60m (200ft) 9,600 (9.6K) 30m (100ft) 19,200 (19.2K) 15m (50ft) 38,400 (38.4) 7.5m (25ft) 57,600 (57.6K) 5.0m (16ft) 115,200 (115.2K) 2.5m (8ft) This ASSUMES full RS-232C compliance. Once upon a time it was common to use +_12 TO 15 VDC for the power supply on the RS-232(C) Line drivers. +- 5-9v is a lot more common now. AND RS-232 compliant cabling NOT CAT 5 or speaker wire, er oh I guess unless it Monster cable. ;o) And when you run RS-232 through CAT 5 twisted pair cabling what signals are you pairing together? Tx and RX, TxD and ground??? BOTH wrong. If it was RS-422 differential then Cat 5 would be very nice. BUT- one of the main purposes' is to find a terminal server here so we don't have to run cabling to a dedicated location. I have seen several post using a pc which will obviously work for small port counts (1-4). -But- a terminal server consumes <2W /channel has no hard drive or software to install (or fail). And even a 32 port device is the size of a six pack. AND for those who fancy Linux that's what they run, not that the OS makes ANY difference what so ever in an embedded application. ALSO many folks don't have a clue that if you read the data sheet for PC power supply they ARE NOT rated for 24x7 POH(Power on Hours) most are limited to less than 70%POH. Whoops I almost forgot same problem with many desktop disk drives AND almost all 2.5" drives. Even IBM's wonderful microdive are limited 50 POH/week. Sorry. Let's come up with a solution for this problem! _________________________________________________________________ KX-T Mailing list --- http://kxthelp.com/ Subscription changes: http://kxthelp.com/mailman/listinfo/kxt
