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(12) 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.
(13) Disable Auto Power Off
In order to disable auto power off function, power on the meter with pressing anyone of switches, except
HOLD switch, back light switch or BLUE switch (for function change) is pressed down.
(14) RS232
Sent a single command string H ( Hex code 48 ) to the multimeter or shine the flashlight on the RS232 socket of the
meter to enable or disable the RS232. When enable the RS232 the LCD display shows the RS232 annunciator.
The serial data is send 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.
0
1
LSB MSB
-12V
12V
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