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Installation and Configuration
User Options and Settings
30 Operating Manual for RS-232 for XT/HPD Series Power Supply
TTL
Shutdown
You can use the Shutdown function to disable or enable the supply's output.
Disabling the supply using TTL shutdown allows you to make adjustments to the
load or to the power supply without shutting down the power supply. With the
RS-232 interface installed, TTL shutdown is activated by a TTL signal to Pin 1 of
the J7 connector on the interface subplate. The shutdown user line uses a 0-5Vdc
TTL input with a high signal range of 2.2-5.0Vdc. The current range of the
shutdown line is 1-10mA. See Figure 2.6, “J7 User Signal Connector Circuit Block
Diagram” on page 32 for a schematic of the J7 connector containing the shutdown
user line.
You can select the logic level of the TTL input by changing the J117 connector on
the RS-232 PCB. Table 2.14 shows the TTL signal levels for the J117 jumper
settings. See Figure 2.3, on page 17 for the location of the J117 jumper on the
printed circuit board.
Table 2.14 Switch Settings for TTL Shutdown Circuit Logic
PCB Jumper J117
Position
TTL Signal Level Supply Output Condition
Pin 2 to Pin 3 (default) HIGH
LOW
OFF
ON
Pin 1 to Pin 2 HIGH
LOW
ON
OFF