Copyright © 2017 Thorlabs
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TED4015
3.11 Digital I/O ports
The tempererature controllers of the TED4015 series have a very versatile digital port providing
four separately configurable Input / Output lines. This feature allows control of external circuitry
from the unit, or control of the unit from external circuitry (via PC software). Figure 58 shows the
pin layout of the 6 pin Mini-DIN jack (R13, see section
Operating elements at the rear panel
).
Digital I/O jack
(Mini-DIN 6, female, rear panel
view)
Pin
Connection
1
I/O1
2
I/O2
3
I/O3
4
I/O4
5
GND
6
I/O Supply voltage (+12 V from internal or higher external
voltage up to +24 V)
The figure below shows the I/O port basic circuit (applicable for each channel).
Any I/O line configured as input accepts TTL levels (0 V / +5 V) and is tolerant of higher
voltages up to +24 V. When the input is left open, an in5 V pull-up resistor in series with
a diode shifts the input to high level.
Any I/O line configured as output can source up to 2 mA when high (+5 V) and sink up to 400
mA when low.
The outputs are current-limited and infinitely short-circuit proof.
Additionally a +12 V supply output is provided to drive a relay or other external circuitry. The
maximum output current is 500 mA. This supply output is current-limited and infinite short-cir-
cuit proof.
The following figures show three typical output configurations.
