Pelco Esprit ES 3012 daisy chain wiring termination question

[floridaBill 0]

Getting ready to install a few esprit systems in a daisy chain using CAT 5. We are using one KBD 300A keypad (RS422) controller in P protocol in direct mode. Running video back on coax to a monitor. In the esprit 3012 housing there are switches for TX and RX termination.

I understand Video termination but I am not sure about when to use data line termination.

 

Any help would be appreciated.

[postaleyes 0]

RX is recieve data and TX is transmit data. Straight through data has the RX connected to the RX on the camera and the RX from the data source and the same for TX. Crossover has RX going to TX and TX going to RX.

 

Is it a 2 or 4 wire system?

[tomcctv 190]

hi. from your rs 422 link box (j-box) pin 1 is tx+ pin 2 is tx- run data to RX+ and RX- on each camera

[survtech 0]

Data line termination is the same as video line termination. Signals are terminated at the ends of a daisy chain but not in the middle.

 

Also for most PTZs, it is not necessary to employ bidirectional communications. Unless you desire alarm or some other auxilliary functions, PTZ control only requires one way data flow - from Tx on the controller to Rx on the PTZs.

 

Tx+ (on controller) to Rx+ (on PTZ) and Tx- (on controller) to Rx- (on PTZ) - to Rx+ and Rx- on second PTZ... Termination "off" on all middle PTZs and "on" on last PTZ in the daisy chain.