OnCell G3100 Series
Configuring Serial Port Operation Modes
8-14
The optimal force transmit time depends on your application, but it must be at least larger than one character
interval within the specified baudrate. 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 needed 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 should set the force transmit time to be larger than 8.3 ms, so in this case, it must be greater
than or equal to 10 ms.
If it is necessary to send a series of characters in the same packet, the serial device will need to send that series
of characters within the specified force transmit time, and the total length of data must be less than or equal
to the OnCell G3100’s internal buffer size (1 KB per port).
UDP Mode
Destination address 1
through
4
(default=None): In UDP mode, you may specify up to 4 ranges of IP
addresses for the serial port to connect to. At least one destination range must be provided.
ATTENTION
The maximum selectable IP address range is 64 addresses. However, when using multicast, you may enter IP
addresses of the form
xxx.xxx.xxx
.255
in the
Begin
field. For example, enter
192.168.127.255
to allow the
OnCell G3100 to broadcast UDP packets to all hosts with IP addresses between
192.168.127.1
and
192.168.127.254
.
Local listen port
(default=4001): This is the UDP port that the OnCell G3100 listens to and that other devices
must use to contact the OnCell G3100. To avoid conflicts with well-known UDP ports, the default is set to 4001.
Packet length (default=0):
The Packet length setting refers to the maximum amount of data that is allowed
to accumulate in the serial port buffer before sending. At the default of 0 for packet length, no maximum
amount is specified and data in the buffer will be sent as specified by the delimiter settings or when the buffer
is full. When a packet length between 1 and 1024 bytes is specified, data in the buffer will be sent as soon it
reaches the specified length.
