Installation and Configuration
User Signals
Release 1.2
25
Table 2.7
Switch Settings for TTL Shutdown Circuit Logic
User Signals
Connector
J21 User
Signals
Auxiliary connector J21, located on the GPIB interface rear panel, provides several
signals to increase your operating control of the supply. These signals are
dependent on the operator's design and uses. The operation of the J21 signal
requires that you provide external Vcc and ground. Use a standard 8-position
telephone jack and data cable to connect to J21. To locate the connector, refer to
the GPIB interface subplate drawing in Figure 2.2, on page 21. See Figure 2.4,
“User Signals J21 Connector” on page 26 for pin descriptions. The J21 outputs can
sink a current of 5mA each. Figure 2.5, “J21 User Signal Connector Circuit Block
Diagram” on page 27 shows the portion of the option board schematic which
contains the J21 connector. Use the schematic as a reference when making input or
output connections.
PCB Jumper J3 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
