KTI Networks KSC-240 Guide d'installation télécharger pdf (Page 26)

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SW1-8&7

BIAS-D RS-485/422 receiver line bias is disabled

BIAS-E RS-485/422 receiver line bias is enabled

The line bias is used to maintain the proper idle-state voltage to the idle

condition (when no driver is enabled on the bus). These bias resistors are

pull-up resistors on the data B line and pull-down resistors (to ground)

on data A line. In 4-wire configuration, the bias resistors are placed on the

receiver lines. [BIAS-D] disables the internal BIAS resistors on receiver

lines.

[BIAS-E] setting enables internal bias resistors. The bias configuration

can support up to 30 receiver nodes with no terminators. If the bias

configuration is not proper for your physical topology, set to [BIAS-D]

and use external bias design according to your application.

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KTI Networks KSC-240 Guide d'installation Page 26