TDK-Lambda LC1202, Instruction Manual

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83494001 Rev H Page 14 of 27
Remote Control Interface (Continued)
23
HV Off LED
Open collector through 100

. Low impedance when HV output is
off/disabled. See Note 1.
25 GND
Control circuit return. Also chassis/earth ground.
Note 1. For LC1202L or LC1202S models, the front panel LEDs are driven by open collec-
tor drivers that are common to the remote control interface indicator signals. A pullup
resistor is not required to sense the remote interface voltage on these signals. The user
should expect the Active Logic level (low) to be between 2 and 4V. If an external pullup
resistor is added, the Active Logic level (low) voltage will be higher.
For LC1202-OEM models, a pullup resistor is required to sense voltage levels at these
outputs.
For applications that require logic level inputs the use of an opto-isolation device is
recommended.