Serial Port Configuration
66
Model 2285 Getting Started Guide
4 • Serial port configuration
Serial device connected to Model 2285 can control TCP/UDP connection of Model 2285 by controlling
DTR signal of it.
Note
DTR/DSR behavior configuration will not be effective when the modem is
enabled. DTR/DSR behavior does not effective in RS422 and RS485 mode.
•
Inter-character timeout
: This parameter defines the interval the Model 2285 fetches the overall serial data
from its internal buffer. If there is an incoming data through the serial port, the Model 2285 stores data into
the internal buffer. The Model 2285 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 at 0, then data stored in the internal buffer will be transferred imme-
diately 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.
