Figure 10-14 Control signal output circuit
10.4.2.2 DC Isolation Input Signal
DC isolation input signals include EXT_RESET and EXT_START signals.
The EXT_RESET signal (pin 22 of the Trans Handler) is input to the optocoupler LED (on the
cathode side). As long as this is low level, the keys on the front panel of the instrument will all be
locked. The optocoupler LED (anode side) can be driven by internal voltage (+5V) or external
voltage (EXT_VCC).
The EXT_START signal (pin 23 of the Trans Handler) is input to the LED cathode side of the
optocoupler. The instrument is triggered when the signal increases from LOW to HIGH. The
optocoupler LED (anode side) can be driven by an internal pull-up voltage (+5 V) or an external
voltage (EXT_VCC).
The input circuit configuration of the DC isolated input signal is shown in Figure 10-15.
Figure 10-15 Control input circuit
To Next Page
