EIA-422
RS-422
<communications, standard> (Formerly "RS-422") An {EIA}
{serial line} {standard} which specifies 4-wire,
{full-duplex}, {differential line}, {multi-drop}
communications. The mechanical connections for this interface
are specified by {EIA-449}. The maximum cable length is
1200m. Maximum data rates are 10Mbps at 1.2m or 100Kbps at
1200m. EIA-422 cannot implement a truly multi-point
communications network (such as with {EIA-485}), although only
one driver can be connected to up to ten receivers. The best
use of EIA-422 is probably in {EIA-232} extension cords.
Comparing EIA-422, 423, 449 to RS-232-C
(http://rad.com/networks/1995/rs232/rs449.htm). Details
on RS-232, 422, 423 and 485
(http://rs485.com/rs485spec.html).
(2002-10-05)