2bsignal, 3bsignal – AAEON TKS-G21-CV05 User Manual
Page 22
E m b e d d e d B o x
T K S - G 2 1 - C V 0 5
Chapter 2 Quick Installation Guide
2 - 8
5 TXD+
6 N/C
7
RXD-
8
N/C / +5 Volt. / (+12 Volt.)
9 Ground
10
N/C
RS-485 Mode
Pin
Signal Pin
Signal
1 TXD-
2 N/C
3 N/C
4 N/C
5 TXD+
6 N/C
7
N/C
8
N/C / +5 Volt. / (+12 Volt.)
9 Ground
10
N/C
Note:
Issue: COM port limitation for the speed test during the communication.
Root Cause:
In serial communication, data bits received at the serial port are bundled
into a byte and transmitted into the serial port hardware buffer. From the
buffer, the byte is sent into the CPU. If a new byte arrives before the byte
in the buffer is moved into the CPU, a Hardware Overrun Error occurs.
Solution:
1. Try hardware handshaking.
2. See if the UART is an older un-buffered version or a new buffered
UART (such as a 16550A or 16750). You should use a buffered UART
for the reasons discussed above.
3. Change the Receive (Rx Trigger) buffer to 8, 4, or 1 (1 is a last resort).
4. For the product, the speed setting of Series Port (COM) is under
9600bps.