86
External Input/Output Terminal and Signals
Signal descriptions
1
Isolated power supply
Pin Signal name
EXT.I/O mode switch (NPN/PNP) setting
NPN PNP
8 ISO_5V Isolated power supply +5 V Isolated power supply -5 V
9, 27 ISO_COM Isolated common signal ground
2
Input signals
START The START signal starts a test and generates output voltage.
STOP The STOP signal ends a test and shuts off output voltage.
INTERLOCK
The signal to switch the interlock function between ON and OFF
(When the interlock function is set to be enabled)
Open the signal to switch to ON; or short-circuit, OFF.
When the interlock function is ON, no tests can be started. In addition,
if the interlock function is changed to ON during a test, the test stops.
Refer to “7.7 Interlock Function”(p. 106) to set the interlock function.
LOAD0 to LOAD3 Saved test conditions can be selected. While a LOAD signal is input,
the instrument enters the key lock state, accepting no key operations.
3
Output signals
PASS This signal is output when the comparator judgment is PASS.
UPPER FAIL This signal is output when the comparator judgment is UPPER FAIL.
LOWER FAIL This signal is output when the comparator judgment is LOWER FAIL.
TEST
This signal is output during tests (During discharge, it is output based
on the setting of TEST signal OFF timing).
ERR
This signal is output at the time of a contact check error, short circuit
check error, output voltage error judgment.
It is output when the contact check function or the short circuit check
function is set to ON.
DP0 to DP2
The decimal point position is output in 4 bits when BCD output is used.
(ST5520-01 only)
BCD0 to BCD15
A 4-digit and 16-bit measured value is output.
(ST5520-01 only)
EXT.I/O input and output signals cannot be used while measurement conditions are
changed.
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