ES51984
3 3/4 CAP AUTO DMM
Auto A(DC/AC)
R1 – R2
fixed
R1 → R2,
R2 → R1
fixed
4.000A – 40.00A
40.00A
4.000A
40.00A
A(DC/AC)
Ω
ORi
→
OR1- OR6 ORi
+
1,
400.0Ω – 40.00MΩ
400.0Ω
OR6 → OR1
Capacitor
C1-C7
4.000nF – 4.000mF
4.000nF
Ci → Ci+1,
C7 → C1
fixed
Continuity
Diode
fixed
fixed
400.0Ω
4.000V
400.0Ω
4.000V
fixed
Frequency
FR1 – FR5
4.000KHz –
40.00MHz
4.000KHz
FRi→ FRi+1
FR5→ FR1
Note: Pushing RANGE resets all existing special modes.
3.3 KEY
See Section “Measurement Mode Switching” for the function of this pin.
4. Serial Data Output
The serial data sent to SDO pin twice 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 hogh and low 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 11 packets, or 110 bits. The following figure shows the
format of a data block. The range packet indicates the full scale range of the meter.
Digit 3 through digit 0 are just the digits on the LCD panel. The function packet
indicates the measurement mode of the meter. Status, option 1 and option 2 give the
status of the meter. CR and LF are delimiters used to separate the blocks.
12
11/01/05
CYRUSTEK [ Cyrustek corporation ]
