User's Manual

The DTR option can be set to one of three types: always high, always low or high when TCP/UDP

is opened. If the DTR behavior is set to high when TCP/UDP is opened, the state of the DTR pin

will be maintained high if the TCP/UDP connection is established.

The DSR input behavior can be set to one of two types: none or allow TCP/UDP connection only

by high. If user sets the DSR input behavior as Allow TCP/UDP connection only by HIGH, TCP

connection to remote host from Pro Series is made only when the DSR status is changed from

low to high. And TCP connection to remote host is disconnected when the DSR status is changed

from high to low. And also Pro Series accepts TCP connection from the remote host only when

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.

z 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

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