O.S. engine EC-11 - Page 19

《
communication specification
》
・
UART
・
TTL logic level
3.3V
・
Pin assignment (ECU side connector)
1
2
3
4
connector : JST 04R-JWPF-VSLE-S
・
protocol
《
communication procedure
》
PC
ECU
PC
ECU
1sec
PC
ECU
BCC error
PC
ECU
18
flow control
frame length
38400 bps
8 bit
none
1bit
none
changeable
time postpone
black
+5V power supply output
TXD
RXD
GND
communication protocol
・The internal data of the ECU can be collected by other external devices through its serial
communication function. The communication protocal would show as followings.
red
white
green
response
BCC error
command
response
command
command
command
response
bit rate
data length
parity bit
stop bit
・
abnormal
（
command BCC error
）
・
abnormal (response postpone)
・
normal
・
abnormal
（
response BCC error
）
1
4