Section 1: Introduction; Product Description; Figure 1: Front Panel - Honeywell HDCD8TP User Manual

1.1

PRODUCT DESCRIPTION

The HDCD8TP is an 8-way bi-directional distribution box with connections for half-
duplex RS485 and/or RS232 control. There is an RS485 loop-through connection and
RS485 termination links to enable several units to be connected in a daisy-chain wiring
configuration. The unit is powered by 12 Volts DC @ 250mA.
This unit provides the user the capability of expanding the number of receivers (e.g. PTZ
receivers) in a system. The input to the HDCD8TP can be either an RS485 or RS232
(PC) controller. Each output is capable of transmitting control data via daisy-chain
wiring to thirty-two RS485 units. The maximum distance from the output to the last
receiver on the daisy-chain is 4000 feet.
This unit can be used to extend the distance for controlling RS485 receivers. If the
required distance between an RS232 or RS485 controller and the receiver is greater than
4000 feet, this unit can be installed to extend the distance to a receiver an additional
4000 feet. The RS485 data signal received at the HDCD8TP is regenerated and output
at each of the eight outputs.
This unit can also be used for applications that require a "star-wiring" configuration. In a
star-wiring configuration, each output on the HDCD8TP is connected to a single receiver.
Multiple HDCD8TP units can be daisy-chain wired together to provide the needed
number of outputs for each receiver in the system.
There are three LEDs – one indicates power on and the other two indicate data being
transmitted to or from the receivers. Refer to Section 2.4 for more detailed information
on the operation of the LEDs.
Rev. B
SECTION 1:
INTRODUCTION

Figure 1: Front Panel

1
HDCD8TP Bi-directional Distribution Unit
HAMU000876
12/29/04