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Additional User Options and Settings
TM-XR9B-01XN 2–25
TTL Shutdown Polarity
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 Ethernet/RS-232 Interface installed, TTL
shutdown is activated by a TTL signal to Pin 1 of the user lines 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, “User Lines Signal Connector
Circuit Block Diagram” on page 2–27 for a schematic of the user lines
connector containing the shutdown user line.
You can select the logic level of the TTL input by changing the J93
connector on the Ethernet/RS-232 Interface PCB. Table 2-13 shows the
TTL signal levels for the J93 jumper settings. See Figure 2-3 for the
location of the J93 jumper on the printed circuit board. You will need to
remove the cover to change any jumpers. See “Changing Internal
Jumpers” on page 2–8.
Table 2-13
Jumper Settings for TTL Shutdown Circuit Logic
Pin 2 to Pin 3 (default) HIGH
LOW
OFF
ON
Pin 1 to Pin 2 HIGH
LOW
ON
OFF
TM-XR9B-01XN.book Page 25 Monday, April 19, 2004 9:00 AM