Digital I/O Port, Interlock, And Output Configuration - Keithley 6430 Instruction Manual

12-2 Digital I/O Port, Interlock, and Output Configuration
Digital I/O port
The SourceMeter has a digital input/output port that can be used to control external digital
circuitry, such as a handler that is used to perform binning operations when testing limits.
Port configuration
The Digital I/O Port is located on the rear panel and is shown in Figure 12-1. Note that a
standard male DB-9 connector is used for the Digital I/O port.
NOTE
Figure 12-1
SourceMeter
Interlock and
ONLY.
ONLY.
digital I/O port
D RATING. D RATING.
Digital output lines
The port provides four output lines and one input line. Each open-collector output can be set
high (+5V) or low (0V). Each output line can source up to 2mA or sink up to 500mA. When
using a category register handler for limit testing, output line #4 is typically used for the EOT
(End-of-Test) or BUSY pulse. This pulse from the SourceMeter signals the handler to perform
the binning operation, or indicates a busy condition. (See Section 11, Configuring limit tests.)
SOT line
The input line (SOT) is used by the handler to start limit testing. With the ↓STEST arm
event selected, the handler must pulse SOT low in order to provide event detection which starts
the testing process. With the ↑STEST arm event selected, the handler must pulse SOT high in
order to provide event detection and start the testing process. With the ↑↓STEST arm event
selected, the handler must pulse SOT either high or low in order to provide event detection and
start the testing process.
The four digital output lines and the SOT line are primarily intended for limit testing
with a device handler. See "Limit testing" in Section 11 for details on performing
limit tests and interfacing to handlers and "Triggering" in Section 10 for informa-
tion on programming the SourceMeter to respond to the SOT (start-of-test) pulse
from a handler.
1 = Digital Output #1
2 = Digital Output #2
3 = Digital Output #3
4 = Digital Output #4 (EOT, /EOT, BUSY, /BUSY)
INTERLOCK-
5 = Ground
DIGITAL I/O
6 = Trigger Input (SOT)
7 = +5V
8 = /Interlock
9 = Ground
1 5
6 9