3-DRX
SECTION 3
REMOTE I/O CONNECTOR
All of the features of the 3-DRX are available through the REMOTE I/O connector as
well as a few additional items. To control the 3-DRX a relay (or other dry closure), TTL
level device, or open collector device is all that is needed. The remote control inputs to
the 3-DRX are TTL with internal pull up resistors. Care should be taken not to
5 VDC on these inputs. Proper shielding is necessary and short runs of wire are
recommended.
The Source Status outputs from the 3-DRX are relay closure to common ground and are
capable of driving up to 500 ma at 50 volts MAXIMUM. The Automatic Manual indicator
output is open collector and is capable of driving up to 500 ma at 50 volts MAXIMUM.
The following describe the REMOTE I/O connector:
PIN # FUNCTION
1
Put Digital 1 on line **
2
Select Automatic or Manual in
OR
RS-232 Out to terminal (see text)
3
RS-232 in to 3-DRX
4 Put Digital 2 on line **
5 Relay common and control ground
6 Analog source on line relay closure
7 Digital 1 on line relay closure
8 Digital 2 on line relay closure
9 Automatic Manual indicator output open collector (see text)
** NOTE: Simultaneously
grounding pin 1 AND pin 4
will put the Analog source on line. If
EAS is selected the 3-DRX will switch immediately to the ANALOG input until
pins 1
AND 4 are ungrounded.
