User`s manual

40 www.rabbit.com RabbitFLEX BL300F Options

4.3.10.5 Bidirectional Logic

This section presents the circuit schematic and the characteristics for the bidirectional logic. A birdirec-

tional logic circuit is useful when talking to an offboard device that communicates using the same line for

transmit and receive, such as an I

C device.

Figure 4-15 Bidirectional Logic Circuit

Power On/Reset State: Input

BIDIRECTIONAL LOGIC

VERSION 6.01

10 kW

R4A

1 kW

+5 V

270 pF

1 kW

I/O

Digital Interface

Cell

Digital Interface

Cell

Q1A