Serial Port Configuration
67
Model 2285 Getting Started Guide
4 • Serial port configuration
Figure 35. Modem configuration
Modem configuration
The Model 2285 supports direct modem connection to the serial port. When user wants to connect to a
modem on its serial port, he must configure Modem init-string and DCD behavior on the modem configura-
tion page. The Model 2285 supports modem connection only when host mode is set as TCP mode.
•
Enable/Disable modem
: By enabling this menu, user can attach a modem directly to the serial port of
Model 2285. If this parameter is enabled, Model 2285 considers this port will be used for modem
use exclusively.
•
Modem init-string
: User can specify modem initialization string for his modem in Modem init-string
parameter. When a serial port is set to modem mode by setting Enable/Disable modem parameter as Enabled,
Model 2285 sends modem initialization string to the serial port whenever rising edge of DTR pin is
detected or parameter related with serial port configuration is changed.
•
DCD behavior
: If DCD behavior is set as Allow TCP connection only by HIGH, Model 2285 permits a con-
nection from the remote host only when the DCD status of serial port is high. This feature is useful when
user want to use a serial port only for dial-in modem mode. In this case, if there is no connection through
modem already, Model 2285 will not permit a TCP side connection.
•
Automatic release modem connection
: If Automatic release modem connection is set as Enable, modem con-
nection will be closed by Model 2285 if all TCP connections are closed. If this option is set as Disable,
modem connection will not be closed by Model 2285 even if all TCP connections are closed. Please note
that actual phone line connection will be closed if one of modems closes connection. That is, this option
