© Microhard Systems Inc.
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4.0 Configuration
Select operational status of the Serial Port. The port is in console
mode by default.
Port Status
Values (selection)
Data /
Console
The serial baud rate is the rate at which the modem is to communicate
with the attached local asynchronous device.
Data Baud Rate
Values (bps)
Note: Most PCs do not
readily support serial
communications greater
than 115200bps.
921600
460800
230400
115200
57600
38400
28800
19200
14400
9600
7200
4800
3600
2400
1200
600
300
This setting determines the format of the data on the serial port.
The default is 8 data bits, No parity, and 1 Stop bit.
Data Format
Values (selection)
8N1
8E1
8O1
This setting defines the serial output data framing. In Transparent
mode (default), the received data will be output promptly from the pX2.
Data Mode
Values (selection)
Seamless /
Transparent
When set to Seamless, the serial port server will add a gap between data frames to comply with the
MODBUS protocol for example. See ‘Character Timeout’ below for related information.
In Seamless mode (see Data Mode described on the preceding page),
this setting determines when the serial server will consider the recently
-received incoming data as being ready to transmit. As per the
MODBUS standard, frames will be marked as ‘bad’ if the time gap
between frames is greater than 1.5 characters, but less than the
Character Timeout value.
Character Timeout
Values (characters)
24
The serial server also uses this parameter to determine the time gap inserted between frames. It is
measured in ‘characters’ and related to baud rate.
Example: If the baud rate is 9600bps, it takes approximately 1ms to move one character. With the
Character Timeout set to 4, the timeout period is 4ms. When the calculated time is less than 3.5ms, the
serial server will set the character timeout to a minimum value of 3.5ms.
If the baud rate is greater than 19200bps, the minimum character timeout is internally set to 750us
(microseconds).
