9 - Digital I/O
Overview
78
SMU4000 Series Instruction Manual
Installing a switch on any of these and linking to the external DIO interlock control. Allows for
the limiting of hazardous voltages (Low voltage operation) whenever the switch is opened.
When controlled via the DIO, the High Voltage Interlock works independently from the password
protection, when activated or deactivated, password protection is not required to be removed.
DIO Active High /Active Low
Sets all of the DIO pins to be either Active High or Active Low edge triggered logic.
When using the DIO as an output, for active high the resting state will be low and for the active
low the resting state will be high.
When using as a input, the resting state is always high (4.7kohm pull-up (internal) to +5V).
Pinout
Pin
Functionality
1
5V (500mA Fused)
2
General DIO
3
General DIO
4
General DIO
5
General DIO
6
General DIO
7
Global Trigger Output
8
Global Trigger Input
9
HV Interlock
10
0V
Addi5V and 0V lines are provided for powering external control circuitry. The 5V supply is
internally fused (resettable fuse) to 500mA, see the SMU4000 Series Service Manual for more
information.
Input levels
:
Set direction to
Input
to allow an external device to control the state of the line.
Logic Zero (low): -0.25V to +1V (diode clamped to 0V).
Logic One (high): +1.75V to +5.25V (diode clamped to +5V).
Output levels:
Logic zero (low): open-drain MOS, typically 0.2ohm, 100mA maximum sink.
Logic one (high): nominally 4.7kohm pull-up (internal) to +5V.
Connector Specification
10W (2 x 5 DIL), 2.54mm pitch.
Mates with standard 10W (2 x 5 DIL) female 2.54mm pitch IDC ribbon cable.