FS9721_LP3

Rev. 2.1

14/39

12. Other Functions

12.1

Auto Power Off

In the process of measuring, no matter the function key or switch, if there is no any action on them

within 30 minutes, the meter will be “Auto Power Off” (Standby Mode). In auto power off status to

press the function key or switch, the meter will be “Auto Power On” (Operating Mode). To press

and hold the “SELECT” key to turn the system on, the auto power off function will be cancelled.

In RS232 operation mode, the auto power off function wil be cancelled.

12.2

Buzzer

When press any key or turn any function switch, the buzzer will raise one sound (approx. 0.25

second 〜1 second). When doing the open-short test, if the resistance is smaller than 50Ω, the

buzzer will sound.

12.3

Backlight

The system has the backlight driver output to control the on and off of the backlight circuit. It

provides the convenience to read in a dim light and worse vision. If press the Hold/BLCTR key

over approx. 2 seconds, the backlight will be on, and to press the key again over 2 seconds, the

backlight will be off.

12.4

Serial Data Output

The system has the serial data output function. When the meter is connected with the equipment

that has serial input interface (RS232) such as computer, it can output the measuring data for

recording, analyzing, processing and printing the measuring results.

13. RS232 Transmission Protocol

13.1

Direction: One-way to computer.

13.2

Serial Transer Rate: 2400 bps

13.3

Data Bit: 8 bit.

13.4

Odd and Even Calibration: No

13.5

Data Decimal: Hex

13.6

Data Length: 14 Bytes.

13.7

Data Information: LCD table on-off information.

13.8

Data Format:

1st byte → 1X (X is seg1, 4 bits represent the data on the LCD table)

2nd byte→ 2X (X is seg2, 4 bits represent the data on the LCD table)

3rd byte → 3X (X is seg3, 4 bits represent the data on the LCD table)

and so on

1X → 4 bit，

2X→ 4 bit ，

3X→ 4 bit

……………

EXH→ 4it

13.9

X means: Bit3〜Bit 0→ segn (COM4―COM1)

13.10 Sampling Rate: 40KHz

13.11 ADC Output Frequency: 40Hz

13.12 ADC Output Frequency After Average: 10Hz

13.13 Output Frequency After Auto-Zero: 4Hz