Chapter 1. Installation
1 5
Trigger Inputs
Internal Schematic
TRG-A & TRG-B connected to GND
(normally-open switches).
The active level (default is active low) can be changed
with the
INLVL
command.
These inputs are like the general-purpose inputs on
the 50-pin header. The differences are (1) the triggers
are pulled up via the AUX-P pull-up terminal, which is
shipped from the factory connected to the in5V
supply via resistor R45; and (2) the triggers can be
programmed with the
INFNCi-H
command to function
as position capture inputs and registration inputs.
SHLD
+5V
OUT-P
IN-P
TRG-A
TRG-B
GND
OUT-A
OUT-B
GND
ENBL
+5V
AUX-P
AUX Connector
Digital
GND
+5VDC
Chassis
Ground
Both trigger inputs
(TRG-A and TRG-B)
share a common
circuit design.
6.8 K
W
R45
(0 K
W
)
47 K
W
74HCxx
OEM6250
R45
AUX-P
Location of
resistor R45.
As shipped from the factory, AUX-P is internally
connected to +5V via resistor R45 (input is sinking
current). To make the trigger (TRG) inputs sink current
to a supply other than +5V, first remove R45 and then
connect an external 5-24V supply to the AUX-P terminal.
To source current, first remove R45 and then connect
the AUX-P terminal to the GND terminal. CAUTION:
Failure to remove R45 before connecting AUX-P to
an external supply, or to the GND terminal, or to the
+5V terminal will damage the OEM6250.
NOTE: AUX-P (and R45) are also used by the ENBL,
HOM, POS, & NEG inputs.
+5VDC
HCMOS compatible switching: low
£
1.00V, high
³
3.25V.
Voltage range = 0-24V.
Connection to a Sinking Output Device
Connection to a Sourcing Output Device
Electronic Device
Out 5-24 Volts
Output
Ground
The output should
be able to sink at
least 1mA of current.
(see schematic above)
Pulled up to +5V
(sourcing). To use
an external 5-24V
supply, remove R45.
SHLD
+5V
OUT-P
IN-P
TRG-A
TRG-B
GND
OUT-A
OUT-B
GND
ENBL
+5V
AUX-P
OEM6250
R45
(0 K
W
)
+5VDC
SHLD
+5V
OUT-P
IN-P
TRG-A
TRG-B
GND
OUT-A
OUT-B
GND
ENBL
+5V
AUX-P
Electronic Device
OEM6250
Pulled down
to ground
(sinking)
Out 5-24 Volts
Output
Ground
V1
R1
(see schematic above)
R45
(0 K
W
) is
removed
+5VDC
Connection to a Combination of Sinking & Sourcing Outputs
Electronic Device
OEM6250
Out 5-24 Volts
Output
Ground
V1
R1
R
The value of R must be < 6.8 K
W
and sized such that V
A
< 1.0V when the output is
open and V
A
> 3.4V when the output is closed.
R
1
must be < R. If R
1
is 0
W
, the typical value for R is 450
W
.
SHLD
+5V
OUT-P
IN-P
TRG-A
TRG-B
GND
OUT-A
OUT-B
GND
ENBL
+5V
AUX-P
(see schematic above)
Pulled up to +5V
(sourcing). To use
an external 5-24V
supply, remove R45.
R45
(0 K
W
)
+5VDC
V
A
If you will be connecting to a combination of sourcing and sinking outputs, leave
AUX-P internally connected to +5V via internal resistor R45 (or remove R45 and
connect AUX-P to an ex5-24V supply) to accommodate sinking output
devices. Then for each individual input connected to a sourcing output, wire an
external resistor between the OEM6250’s trigger input terminal and ground (see
illustration). The resistor provides a path for current to flow from the device
when the output is active.
PROGRAMMING TIP
Connecting to a sinking output? Set the trigger input’s active level to
low with the
INLVL
command (
¯
= active low,
default setting).
Connecting to a sourcing output? Set the trigger input’s active level to
high with the
INLVL
command (
1
= active high).
Thus, when the output is active, the
TIN
status command will report a “
1
”
(indicates that the input is active), regardless of the type of output that is
connected.
For details on setting the active level and checking the input status refer to
the
INLVL
and
TIN
commands in the
6000 Series Software Reference.
