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Installation and Configuration
User Signals
30 Operating Manual for RS-232 for XPD Series Power Supply
User Signals
Connector
J21 User
Signals
Auxiliary connector J21, located on the RS-232 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 RS-232 interface subplate drawing in Figure 2.2, on page 21. See Figure 2.5 for
pin descriptions. The J21 outputs can sink a current of 5mA each. Figure 2.6, on
page 31 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.
Figure 2.5 User Signals J21 Connector
J21-1 External TTL shutdown input signal
(See “TTL Shutdown”)
J21-2 Polarity signal, open collector
(asserted by VSET -x)
J21-3 Isolation signal, open collector
(asserted by OUT OFF)
J21-4 Fault signal, open collector
(asserted when bit set in fault register)
J21-5 External Vcc, 15V maximum
(supplied by connecting and operating an external source)
J21-6 External ground and shutdown return
(supplied by connecting and operating an external source)
J21-7 Open collector user signal
(asserted by AUXA ON)
J21-8 Open collector user signal
(asserted by AUXB ON)
J21