WL
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430T 4G Wireless Modem with all function
UserManual
22
The "Use CTS Line" parameter for the port configuration should be set
to 'Y' for most modem applications.
RS-232: Null Modem Connection (Hardware Handshaking)
This type of connection is used when the device connected to the module
requires hardware handshaking (control and monitoring of modem signal
lines).