ES51964(6600counts)
Dual Display
5. Serial Data Output
The RS232 function will be activated if the RS232 pin is pulled to and asserts at V-. The
serial data sent to SDO pin once every A/D conversion cycle. The data format complies
with JIS 7Bits transmission code with a baud rate of 19230. The host can use RS232
interface to read the data. A single data packet includes a start bit (always 0), 7 data bits, an
odd parity check bit, and a stop bit (always 1). The high and low voltage levels correspond
to DGND and V- respectively. SDO remains at 1 (high) when it is inactive. Hence the start
bit (0) could be used as the triggering signal to begin the reading process. The following
figure shows the data format of a single packet. The LSB is sent first and the MSB is sent
last.
single package
0V
p
P 1
D0 ~D6
0
-3V
LSB
MSB
One data block consists of 17 packets, or 170 bits. The following figure shows the format of
a data block. The M_range or S_range packet indicates the full-scale range of main
measurement mode or sub-measurement mode. M_digit3 through M_digit0 are the
conversion result of main measurement mode, and S_digit3 through S_digit0 are the
conversion result of sub-measurement mode(Hz or duty). The function packet indicates the
measurement mode of the meter. Status, option1, option2 and option3 give the status of the
meter. CR and LF are delimiters used to separate the blocks.
all package
0
0
0
0
1 0
1 0
1 0
1 0
1
1 0
1 0
1 0
1 0
1 0
1 0
1 0
1 0
1
1
1
1
M_range
M_digit1
S_digit1
S_range
M_digit0
S_digit0
M_digit3
S_digit3
Function
M_digit2
S_digit2
Status
Option1
LF
Option2
Option3
CR
0
v2.5
22
09/04/14
CYRUSTEK [ Cyrustek corporation ]
