3 INSTALLATION
20
Connecting Optional Serial Port Cables
To connect to a serial port:
1.
Align the male pins on the DB9 connector with the female connector marked
RS-232 I/O, as illustrated in Figure 3-2:
Figure 3-2 — OM 2000 optional serial and interface output connection
2.
Push the cable in until the connector is fully engaged. Do not bend the pins.
3.
Align the captive screws on the connector with the threaded standoffs and then
tighten the screws.
4.
Align the male pins on the DB25 connector with the female connector marked
opt1.
5.
Push the cable in until the connector is fully engaged. Do not bend the pins.
6.
Align the captive screws on the connector with the threaded standoffs on the
back of the unit, and then tighten the screws.
7.
Repeat steps 4 through 6 for the female connector marked opt2.
Connecting the Optional Ground
Connect a ground wire from the OM 2000 to the rack frame using a #10-32 screw.
Connecting Emergency Alert Wiring
The OM 2000 emergency alert function may not operate reliably if an excessive
voltage differential exists between the remote control unit chassis and the OM 2000
chassis. Both chassis must share a common ground to guarantee less than a 0.5 V
differential between the two chassis. You must ensure that the voltage across the
emergency alert terminals meets these requirements when including ground and
wiring voltage drops. If other units are also connected to the same command
contacts, a loss of power or an internal power-supply failure in one of the other units
can cause a false alert condition if the unpowered unit reduces the contact voltage
to 4 V or less.
