RS232 & GPIB INTERFACE
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CHAPTER 11 : REMOTE OPERATION
Two 9 pin “D” type connectors are mounted on the rear panel which provide REMOTE-
I/O control and information. These connectors mate with standard 9 pin D-subminiature
connector provided by the user. The output mates to a male (plug) connector while the
input mates to a female (receptacle) connector. For best performance a shielded cable
should be used. To avoid ground loops the shield should not be grounded at both ends of
the cable.
11.1 Remote Interface Rear Panel
11.2 Signal Outputs on Remote I/O
The rear panel connector provides three output signals to remotely monitor PASS,
FAIL, and PROCESSING conditions. The monitoring signals are provided by
three normally open internal relays that switch on to indicate the current condition
of the tester. These are normally open free contacts and will not provide any
voltage or current. The ratings of the contacts are 1A / 250 VAC ( 0.5 ADC ). The
signal outputs are provided on the 9 pin female type D connector. Below is a
listing that indicates what conditions activate each pin. When a terminal becomes
active the relay closes thereby allowing the external voltage to operate an external
device.
Pins 1 and 2 provide the PASS signal.
Pins 3 and 4 provide the FAIL signal.
Pins 5 and 6 provide the PROCESSING signal.
The following describes how the relays operate for each test condition.
PROCESSING - The relay contact closes the connection between pin (5) and pin
(6) while the instrument is performing a test. The connection is opened at the end
of the test.
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