MAX3223EEVKIT データシートの表示（PDF） - Maxim Integrated

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MAX3223EEVKIT

MAX3223E Evaluation Kit

Maxim Integrated 

MAX3223E Evaluation Kit

Figure 1. RealTerm Software Main Window (Port Tab Sheet)

MAX3223E power-management signals. Jumper JU4

connects the INVALID status output to LED2. Jumpers

JU5–JU8 configure the hardware handshake signals.

Jumpers JU9 and JU10 allow digital loopback. Jumper

JU11 allows RS-232 loopback.

The DCE-connected RS-232 connector (J1) uses

MAX3223E transmitter 1 and receiver 1 for the serial data.

MAX3223E transmitter 2 and receiver 2 can optionally be

used for DTR-DSR or RTS-CTS hardware handshake.

Hardware Handshakes

A hardware handshake consists of two or more signal

wires used to control the flow of information on the other

wires. The MAX3223E does not enforce any hardware

handshake convention, but allows a microcontroller to use

the secondary receiver/transmitter to conduct active flow

control using one of the defined hardware handshakes.

If the hardware handshake is not being actively man-

aged by a microcontroller, then the corresponding

handshake signals should be connected together to

allow data to flow. Without a hardware handshake con-

nection, communication may be blocked.

Tables 2 and 3 provide suggested jumper settings for

the two most common hardware handshakes.

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