LineEye LE-2500XR, Инструкция по эксплуатации

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3.3 Delay Time and Signal Voltage (DELAY)
Delay Time function measures the delay time between state changes of the interface signal, and measures the voltage
(MAX. MIN. Now) of the signals of RS-232C or TTL.
Setting
Press [Menu] and then touch “Function ” -> “Operation: Monitor” -> “DELAY”. Touch “Advanced setting” on
the bottom of screen.
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Start condition
The following nine signal lines are needed to be set : TXD, RTS, DTR, RXD, CTS, DSR, DCD, RI, and TRG
(external trigger signal). Specify the state of each signal by [1](on state), [0](off state), and [END/X](don’t
care).
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Stop condition
Specify the state of each signal as same as start condition.
“On state” indicates the active state of signal. For RS-232C, it is +3 or higher (space state) of voltage level. For TTL, it
is a low level.
For TTL, only TXD, RXD, RTS and CTS are the target signal lines. For RS-422/485, only TXD and RXD are the tar-
get signal lines.
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Target port for measuring signal voltage
To measure TTL, set the measurement port to “TTL” at “ Interface ” setting. If it is set other than “TTL”, RS-
232C will be the target port.
Start and End of Measurement
Press [RUN] to start measuring of delay time and signal voltage.
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Display of signal voltage
Measure voltage of target interface and display signal voltage (MAX. MIN. Now).
Target signals
For RS-232C port TXD,RXD,DCD,DTR
For TTL port TXD,RXD,RTS,CTS
Press [Stop] to stop measuring.