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Digital Input / Output Protocol
Digital input/output control of the multiposition actuator is designed for simplicity and flexibility of
function. The simplest control of the actuator can be accomplished with two output control lines –
STEP and HOME. On the other hand, the actuator can accept a latched BCD input with manual and
automatic direction signals.
The inputs are held to a logical high (+5 volts) by pull-up resistors, and are designed to be driven low
either by contact closure, 5 volt digital logic, or open collector transistor outputs. The signal polarity is
defined as "negative true" – asserting the signal involves shorting the signal (in the case of contact
closure) or driving it (in the case of logic or transistor signals) to within 0.8 volts of ground potential.
These input signals must be at least 30 milliseconds in duration. The outputs are also "negative true"
signals driven by standard high speed CMOS gates, capable of driving standard logic input gates.
They include the BCD position, motor run, rotational direction, and error signals. If the actuator stops
out of position due to a stuck valve, the BCD output is set to "0" (all lines high for a negative true
output).
The digital interface is made through a 26 pin connector which also provides power (+5 volts/100 ma
maximum) and ground outputs. The ground should be connected to the control system to maintain
commonality between the actuator and the controlling device. If you intend to provide your own
power supply, make sure that it has an isolated output or that it shares a common ground with the
controlling system.
Pin signal definitions for the Digital Input/Output cable
Pin
Color
1
brown
2
red
3
orange
4
yellow
5
green
blue
6
7
violet
8
gray
9
white
10
black
11
brown
12
red
13
orange
P. O. Box 55603
Houston, TX 77255
Sales toll-free (800) FOR VICI
Technical help (713) 688-9345
Fax (713) 688-8106
Signal
Direction
Home
Input
Motor run
Output
Step
Input
Error
Output
Manual Dir.
Input
Direction
Output
Auto Dir.
Input
Data latch
Input
+5 VDC 100 ma
Output
Ground
Output
10.8 BCD
Output
1.8 BCD
Output
10.4 BCD
Output
Pin
Color
Signal
14
yellow
1.4 BCD
15
green
10.2 BCD
16
blue
1.2 BCD
17
violet
10.1 BCD
18
gray
1.1 BCD
white
10.8 BCD
19
20
black
1.8 BCD
21
brown
10.4 BCD
22
red
1.4 BCD
23
orange
10.2 BCD
24
yellow
1.2 BCD
25
green
10.1 BCD
26
blue
1.1 BCD
Direction
Output
Output
Output
Output
Output
Input
Input
Input
Input
Input
Input
Input
Input
Untertannberg 7
CH-6214 Schenkon
Switzerland
Telephone (041) 925-6200
Fax (041) 925-6201
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