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Electrical Characteristics of Signals
This section provides description of electrical characteristics of each signal and con guration of
I/O circuits.
Electrical characteristics of each signal do not change regardless of the function (comparator
function and list sweep comparator function) used.
DC Isolated Output Signals
Each of the DC isolated signals (pins 1 to 11, 19 to 24, 29 to 31) is output through an
open-collector and photocoupler.
You can use switches on the handler interface board to select the desired power source. The
internal source (5V) or an external power source (5 to 24V for comparator output signals or 5 to
15V for control output signals) can be selected. Note that you usually use an external power
source to supply voltage to control output signals.
You can connect the internal pull-up resistor of 4.7k
to control signals by simply changing
switch settings. Note that you must mount a pull-up resistor to the handler side of the board
for comparator output signals.
Table 4-13. Electrical Characteristics of DC Isolated Output Signals
Comparator Output Signal
Control Output Signal
Figure 4-10 and Figure 4-11 show the circuit con guration of comparator and control output
signals, respectively.
Output
Rated Voltage Output Max. Current COMMON
LOW
0.5V
0.5V
HIGH
5V to 24V
5mA
5V to 15V
5mA
COM1
COM2
4286A with Chip Handler
4-33
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