Xantrex Technology RS232-XPD manual

Installation and Configuration

User Options and Settings

TTL You can use the Shutdown function to disable or enable the supply's output. Shutdown 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 J21 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, “J21 User Signal Connector Circuit Block Diagram” on page 31 for a schematic of the J21 connector containing the shutdown user line.

You can select the logic level of the TTL input by changing the J3 connector on the RS-232 PCB. Table 2.13 shows the TTL signal levels for the J3 jumper settings. See Figure 2.2-3 for the location of the J3 jumper on the printed circuit board.

Table 2.13 Switch Settings for TTL Shutdown Circuit Logic

PCB Jumper J3 Position	TTL Signal Level	Supply Output Condition
Pin 2 to Pin 3 (default)	HIGH	OFF
	LOW	ON
Pin 1 to Pin 2	HIGH	ON
	LOW	OFF

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