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Appendix B: Pin Assignment of TTL I/O
Signals
9-Pin D-Type Male Connector:
Pin No.
1
2
3
4
5
AC LOAD ON
When AC Load is at the "load on" status, this pin turns into HIGH and turns into LOW when
the load is off. It is defined at pin 2 of the TTL I/O. The ground reference of the TTL I/O is at
pin 1.
Transient-ON/OFF
This signal can be used in CC mode (under AC/DC mode). The first cycle of the current sag or
surge is occurred under AC mode, this pin will become HIGH as well as the signal will return
to LOW. If the current has changed under DC mode, this pin will become HIGH as well as the
signal will return to LOW. The ground reference of the TTL I/O is at pin 1.
Fail
The voltage level of this pin is HIGH if AC load is in normal state. It turns into LOW when AC
load is in abnormal status, such as OCP, OVP, OPP, OTP or Fan Fail. It is defined at pin 4 of
the TTL I/O. The ground reference of the TTL I/O is at pin 1.
Short
When short is on, this pin will becomes HIGH, and it becomes LOW when short is off. The
ground reference of the TTL I/O is at pin 1.
External Load ON/OFF
The AC load can be achieved by TTL high signal. When CONF./LOCAL is pressed, choose 1,
"SETUP", and then go to item 6, "External load ON/OFF ENABLE". Enter into this function
through the knob. The execution of the "load on/off" will transfer from front panel to pin 9 of
TTL I/O. The ground reference of the TTL I/O is at pin 1. The LOAD ON/OFF button in front
panel will become invalid under this setting.
Signal
GND
Load-ON/OFF
Transient-ON/OFF
Fail
Short
Appendix B: Pin Assignment of TTL I/O Signals
Pin No.
6
7
8
9
External Load-ON/OFF
Signal
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B-1
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