ATI Technologies Scan Alarm C14, Руководство пользователя

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RS-485 Interface
You can communicate with up to 32 Scanners on a single common loop.
Wire equipment in a single “daisy chain” using twisted shielded pairs for the RS-
485 cables. Don’t use “octopus”, or “spurs”, or “star” patterns.
Use the internal 200 Ohm terminating resistor on the RX line of the last Scanner
in the system. (If you have only one scanner, it is the last scanner in the system).
Use jumper JU1 to select the terminating resistor; place it in B position for
termination and A position for non-termination.
Connect the shields to earth ground only at the computer or other R485 interface.
Do not connect the shield to the Scanner.
NOTE
If you connect RS-485 communications and they do not function
properly,
or if you have measurement problems when
communications lines are connected, request additional technical
information from our Technical Service Department.