I-View PTI-100 P.O.S. DVR - Manual (Page 7)

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P 3-P16: No use.
EX-400USB 4 ports RS-485 Interface
z RS-485: Each EX-400USB can connect 4 sets PTI-100.
Y: Transmitter (+) Z: Transmitter (-) A: Receiver (+) B: Receiver (-)
To avoid the interference problems, each twisted pair cable must be connected to Y&Z or
A&B port. i.e. Y and A (Z and B) port can not use a twisted pair cable.
1-4. System Configuration: