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Configuring the Modem
Page 23
SW3-2 − Data Rate (Fast-Poll Mode Only)
SW3-2 ON = 4800 bps
OFF = 9600 bps
SW3-2 configures the modem speed. When the modem is in high-
speed fast-poll mode (SW3-1 OFF), setting SW3-2 ON selects 4800
bps, while setting SW3-2 OFF selects 9600 bps.
SW3-3 − Async Character (Fast-Poll Mode Only)
SW3-3 ON = 11 bits
OFF = 10 bits
Switch SW3-3 selects whether the async character is 10 or 11 bits long.
When the modem is in high-speed fast-poll mode (SW3-1 OFF),
setting SW3-3 ON selects an 11-bit async characters, while setting
SW3-3 OFF selects a 10-bit async character.
SW3-4 − Auto RTS (Fast-Poll Mode Only)
SW3-4 ON = Enable Auto RTS
OFF = Disable Auto RTS
For data terminals that do not support hardware RTS, set SW3-4 to ON
to enable auto RTS mode. In this mode, TXD is detected at the modem
and an internal RTS signal is turned ON. After training completes, the
TXD is transmitted to the remote modem. The transmitter turns off if
no TXD is detected after 1 character length of idle time. Auto RTS is
used in fast-poll mode only (SW3-1 set to OFF).