54
Table 4-4 Default value of S-Registers
Index Default Value Index Default Value Index Default Value
0 ~ 1 0 2 43 3 13
4 10 5 8 6 2
7 30 8 2 9 6
10 14 11 100 12 50
13 ~ 24 0 24 5 25 1
26 ~ 37 0 38 20 39 ~ 99 0
Figure 4-7 Typical case of command/data flow of modem emulation mode
In modem emulation mode, user can also set specific phone number to host address/port mapping
table. If user set the phone number to host address/port mapping table as shown on Figure 4-8, Pro
Series will try to connect to port 7001 of 192.168.1.1 host by the ‘atdt5737772’ command in modem
emulation mode.
2) Parameters
DTR/DSR behavior
Purpose of the DTR/DSR pin is to control TCP/UDP connection state by using serial port signal. The
DTR is a write-only output signal, whereas the DSR is a read-only input signal in the Pro Series.
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