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Only a single camera site can be connected in this manner --
RS-232 signals can not be wired using a 'daisy chain'
connection. Be sure to use cable suitable for use with RS-232
signals.
Skip to the section on "AutoDome Camera or Receiver/Driver
Site Configuration" to complete the installation.
4.4
Installation using an RS-232 Data Transmission
Link to a Biphase Camera Site
In this application, the RS-232 data that is generated by the
Controller is connected directly to an RS-232 transmission link
(fiber optics, microwave, dial-up phone modems, etc.). The
RS-232 transmission link must be able to support an RS-232
simplex transmission rate of 9600 baud. At the other end of the
RS-232 transmission link, the RS-232 signal is converted into
the Allegiant biphase protocol using the supplied interface unit.
The biphase data is then connected to the AutoDome cameras
or Allegiant receiver/driver units.
Install one of the junction boxes supplied in the LTC 8557
Series kits (ordered separately) in a location close enough to the
Controller unit so the supplied 360 cm (12 ft) data cable can be
used. If desired, four holes are provided for mounting the
LTC 8557 Series junction box to a flat surface. The power
supply (to power the Controller) should also be located in a
convenient location near the LTC 8557 Series junction box.
Connect the 'bayonet' style connector of the power supply cable
into the jack located on the side of the junction box. If the
power supply cable must be attached to the power supply, the
polarity is not important; the Interface Unit is not polarity
sensitive. Plug the power supply into a suitable AC power
source.
Connect the supplied 360 cm (12 ft) data cable with two RJ-11
connectors between the Controller unit and the junction box.
The orientation is not important -- either end may be
connected to either device.
Connect an appropriate length of cable (not supplied) suitable
for use with RS-232 signals between the LTC 8557 Series
junction box and the RS-232 transmission device. If the
distance between the box and device is much over 20-30 meters
(60-90 ft), the use of 'short haul modems' (supplied by others)
or other RS-232 line extender devices may be required. They
must be able to support an RS-232 simplex transmission rate of
9600 baud.
The LTC 8557 Series junction box provides a removable screw
terminal block for the data connections. The terminal block has
four connections marked 1, 2, 3, & 4 as shown in the diagram
below.
Junction Box Supplied with LTC 8557 Series Kit
Pins 1 and 2 are not used. Pin 3 is the Controller's RS-232
"Tx" output, and pin 4 is the Signal Ground connection. Be
sure to use cable suitable for use with RS-232 signals. Connect
the wire from terminal 3 to the "Rx" connection of the RS-232
transmission device. Respectively, connect the wire from
terminal 4 to the data ground connection.
At the camera side of the RS-232 transmission device, install the
second junction box supplied in the LTC 8557 Series kit
(ordered separately) and the interface unit in a convenient
location where they can easily be connected together using the
supplied 360 cm (12 ft) data cable.
Note that both the junction box and interface unites are rated
for indoor use only. If desired, four holes are provided for
mounting the boxes to a flat surface.
No power supply is required when the junction box is used for
this purpose. The interface unit does require use of the
supplied power supply and it should be located in a convenient
location close by. Connect the 'bayonet' style connector of the
power supply cable into the jack located on the side of the
interface unit. If the power supply cable must be attached to the
power supply, the polarity is not important; the Interface Unit
is not polarity sensitive. Plug the power supply into a suitable
AC power source.
Connect the transmit wire from the RS-232 transmission device
to pin 2 of the junction box. Connect the signal ground to pin
1 of the junction box.
1.4
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