Impulse 2123 Uživatelský manuál stáhnout pdf (Strana 10)

Interface Biasing

1K-ohm pull up/pull down combination resistors bias the receiver inputs and are

handled automatically for each mode. The pull-up (PU) and pull-down (PD) resistor

settings are shown in the table below.

Mode PU Setting PD Setting

RS-232

Always Off Always Off

RS-422

Always Off Always Off

RS-485

Always On Always On

Line Termination

A 120-ohm resistor is across the RS-422/485 input. If multiple devices are

configured in an RS-485 network, only the devices on each end should have the

termination in place.

Termination configuration is software selectable for both full- and half-duplex RS-

485. By default, line termination is disabled, and this configuration can be set by

placing a check next to ‘Enable Termination’ in the ‘RS-485 Advanced

Configuration’ field, as shown in the image below.

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Impulse 2123 Uživatelský manuál Strana 10