found some good deals ......

[Chuck <charlesmorris@xxxxxxxxxxxx>]

I found a few good deals and they are in the mail:

1) Speco HT650PT10X High Resolution Motorized Dome Camera

2) Speco DVR4TL250 4 Channel DVR



Now a few questions please -- the DVR has BNC camera inputs but the
instructions for the camera are a little more complex:


------------

Connect the camera using the supplied terminal block:

A) Connect the control unit via the twisted, 2-conductor line (max length
length 1200 meters) to the pin array 5 (RS485A) and 6 (RS485B).  Connect all
cameras in parallel to this 2 conductor control line.


B) Feed the video signal at contact 3 via a shielded cable to the video
input of the following unit (eg, monitor, camera switcher, video splitter)

Connect the shield to contact 4.


C) 12V + to pin 1 and ground to pin 2.


-----------



Ok now ..... RS485 control signals interface at a terminal block on both the
camera and DVR.  What is the best twisted wire pair to use for this?  Would
one twisted pair of a Cat 5 cable work ok for 100 yards?

If Cat 5 cable is used for the RS485 control signals, can I transmit the
video and "shield" down a second twisted pair in the same Cat 5 cable?

Could I ship 12 volts and ground down a third twisted pair in the same
cable?  If so, how far?


Last problem, the DVR has BNC connectors for video in.  Would I just soldier
a BNC connector on the video cable for connection at the DVR?  What about
impedance matching?  Any problems to watch for?  What am I missing?

Thanks.