User's Manual

1UNPACKING
Unpack carefully. This is electronic equipment and
should be handled carefully.
Check for the following items:
• Verify the model number of the unit
• One (1) cable with 9-pin D-sub connectors
• Connector Kit, containing eight (8) pieces of a
twelve (12) pin connector
• Installation manual
If an item appears to have been damaged in shipment,
replace it properly in its carton and notify the shipper.
If any items are missing, notify your Bosch Security
Systems, Inc. Sales Representative or Customer
Service.
The shipping carton is the safest container in which the
unit may be transported. Save it for possible future use.
2SERVICE
If the unit ever needs repair service, the customer
should contact the nearest Bosch Security Systems, Inc.
Service Center for return authorization and shipping
instructions.
Service Centers
USA
Phone: [phone] or 717-735-6638
fax: [phone] or 717-735-6639
CCTV Spare Parts
Phone: [phone] or 408-956-3853 or 3854
fax: [phone]
e-mail: [e-mail]
Canada
Phone: [phone]
Europe, Middle East & Asia Pacific Region
Phone: [phone]
For additional information, see
www
.boschsecuritysystems.com.
3DESCRIPTION
The LTC 8785 Series are control code converters that
convert Allegiant
®
series “variable speed” biphase
control codes into “fixed speed” biphase control codes.
When AutoDome
®
pan/tilt/zoom cameras are added to
existing Allegiant systems, it is usually preferable to
operate them in their variable speed mode. The
LTC 8553/00 and LTC 8555/00 keyboards containing
proportional joysticks must be added to the system
along with an upgrade of the system CPU so the new
variable speed control codes can be generated. If the
existing system contains older type TC8561 Series
receiver/drivers, there will be a code compatibility
problem. The older TC8561 Series receiver/drivers
were only designed to operate using “fixed speed”
control codes and will not function when the newer
variable speed codes are being received. To solve this
problem, the LTC 8785 Series code converters have
been designed to maintain a source of “fixed speed”
control codes in this type of system.
The LTC 8785 Series provide 32 separate outputs for
driving up to 256 existing TC8561 Series
Receiver/Drivers. Either “star" or “daisy chain" wiring
configurations may be used. Each output is capable of
driving up to 8 receiver/drivers in a “daisy chain”
configuration up to 1500 meters (5000 ft) using 1 mm
2
(Belden 8760 or equivalent 18 AWG) shielded twisted
pair. A 2 meter (6 ft) data cable for interface to the
existing Allegiant LTC 8568/00 Signal Distribution
Unit is supplied. The unit will also accept control code
supplied from LTC 8569 Series, LTC 8571 Series, or
LTC 8572 Series Code Merger units.
LTC 8785 Series | Instruction Manual | Unpacking
EN
|
7
Bosch Security Systems | 19 April 2004