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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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