User Guide

18
The function packet indicates the measurement mode of
the meter. Status, option 1 and option 2 gives the status of
the meter. CR and LF are delimiters used to separate the
blocks.
The meter always outputs the current input value to the
serial port. Each block is repeated twice in one conversion
cycle. The detailed data format of each packet is listed
below.
- Function
This packet indicates the measurement mode of the meter.
The following table summarizes the transmitted code for
each mode.
Code Measurement Mode
0111011 Voltage
0111101 µA Current
0111001 mA Current
0111111 A Current
0110011 Ω
0110101 Continuity
0110001 Diode
0110010 Frequency / RPM
1
0110110 Capacitance
Note 1: The judge bit in the Status packet determines whether it is frequency
mode or RPM mode.
17
Data Acquisition Function
1. Auto Power Off (APO)
The APO sign on the LCD panel indicates the meter is
working in the Auto Power Off mode. If the meter idles for
more than 30 minutes, the meter automatically turns the
power off. When this happens, the state (non-logic
measurement) of the meter is saved, the meter can be
turned back on by pushing any key switch, except back
light switch, or changing the rotary switch. If the meter is
Re-Powered on by pushing key switch, the LCD displays
the saved state when meter auto power off itself, pushing
Hold key switch to disable the hold state. The meter will
give periodic alarm in 15 seconds before automatically
turns power off by itself, any key press or rotary change
reset Auto Power Off.
2. Disable Auto Power Off
In order to disable auto power off function, power on the
meter with pressing anyone of the switches, except the
HOLD switch, back light switch or BLUE switch (for
function change) is pressed down.
3. RS232
Sent a single pulse to the multimeter to enable or disable
the RS232 when enable the RS232 the LCD display shows
the RS232 annunciator
The serial data is sent from RS232 cable twice every A/D
conversion cycle. The data format complies with JIS 7BIT
transmission code with a baud rate of 2400. The user can
use RS232 interface to read the data. A single dada packet
includes a start bit (always 0), 7 data bits, an odd parity
check bit, and a stop bit (always 1). The following figure
shows the data format of a single packet. The LSB is sent
first and the MSB is sent last.
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 is just the digits on the LCD panel.