SENA PS210W - Manual (Page 63)

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the DSR status is high. In case of UDP mode, Pro Series receives UDP data from the remote host
only when the DSR status is high. But In modem emulation mode, the connection to the remote
host will be disconnected when the DSR status is changed from high to low regardless of the
value of DSR behavior.
Serial device connected to Pro Series can control TCP/UDP connection of Pro Series by
controlling DTR signal of it.
Note :
1. DTR/DSR behavior configuration will not be effective when the modem is enabled.
2. DTR/DSR behavior does not effective in RS422 and RS485 mode.
 Inter-character timeout
This parameter defines the interval the Pro Series fetches the overall serial data from its internal
buffer. If there is an incoming data through the serial port, the Pro Series stores data into the
internal buffer. The Pro Series transfers data stored in the buffer via TCP/IP, only if the internal
buffer is full or if the inter-character time interval reaches the time specified in the inter-character
timeout setting. If inter-character timeout is set as 0, then data stored in the internal buffer will be
transferred immediately without any delay.
Optimal inter-character timeout would be different according to your application but at least it must
be larger than one character interval within specified baud rate. For example, assume that the
serial port is set to 1200 bps, 8 Data bits, 1 stop bit, and no parity. In this case, the total number of
bits to send a character is 10 bits and the time required to transfer one character is
10 (bits) / 1200 (bits/s) * 1000 (ms/s) = 8.3 ms.
Therefore, you have to set inter-character timeout to be larger than 8.3 ms. The inter-character
timeout is specified in milliseconds.
4.2.7. Modem configuration
The Pro Series 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
configuration page. The Pro Series 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 Pro Series. If this
parameter is enabled, Pro Series 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, Pro