User`s manual

3.5
Using RS485 Multi-Drop
Procedure
1. Switch each camera to RS422 operation using the procedure detailed on page
3.3 of this manual.
2. Give each camera a unique address using the ADR and SAV commands.
Assign the camera that will be furthest away from the host computer an
address of 99. When you are using multi-drop communications the camera
furthest away from the host computer must have resistive terminators con-
nected to the RS485 signal lines. Setting the last cameras address to 99
connects internal termination resistors to the RS485 lines of that camera.
3. Use the MDD ON command to turn multi-drop mode on prior to connecting
a camera to a network like the one illustrated at the bottom of this page.
Each computer has a frame grabber board to process the images from the
camera connected to it. Personal computer number one is controlling all of
the cameras through its RS485 I/O card.