-9-
LED and Display
ڦ
Power LED
Light in green during operation. Blink in red while it charges a battery.
Slow charge: Blink per 4 sec.
Normal charge: Blink per 1.5 sec.
Fast charge: Blink per 1 sec.
2.7 System Menu (Auto Power Off and Charging Battery
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Line state LED
Line state LEDs indicate the logical status (voltage level) of the input/output data on the signal lines con-
nected to the measurement port in real time.
There are two groups: Signals for DTE device and for DCE device.
・
Signal names of line state LED are comforting to JIS X 5101 standard.
・
Enclosed No. is the pin number of RS-232C port.
・
The correspondences between signal voltage and LEDs are below:
VM
：
Voltage Level of RS-232C
VA
：
Voltage Level on the RS-422/RS-485 [-Terminal]
VB
：
Voltage Level on the RS-422/RS-485 [+Terminal]
VT
：
TTL Level
VIL
：
Minimum of the threshold of input level H
VIH
：
Maximum of the threshold of input level L
1)
Measuring [ ], Pause [ ]
2)
Information of measured data
3)
Selected interface (selected measurement port).
4)
Selected function [Mon]: Monitoring, [DTE/DCE]: Simulating
*1
, BERT
5)
Status of USB device port (Bright: Connected)
6)
Status of USB host port (Bright: Connected)
*2
7)
Status of SD card slot (Bright: Connected)
*2
8)
Level of remained battery. [
]indicates “ USB bus power”
9)
Setting items or measured data.
*3
10)
Touch panel for advanced settings.
*3
*1: [Sim] is displayed if it selects TTL port without defining DTE/DCE.
*2: Color in red while analyzer is accessing to the storage device.
*3: Touch control.
ڦ
Data display window
1)
2)
3) 4) 5) 6) 7)
8)
9)
10)
Voltage Level on the Signal Lines
Two-Color LED
RS-232C
RS-422/485
TTL
Red
Green
+3V ≤ VM
VA-VB>+0.2V
VT<VIL
on
off
-3V<<VM<+3V
VA-VB<+0.05V
VIH<VT
off
off
VM<-3V
off
on
