Setting The Rs485 Control Data Termination (Sw1); Figure 3-3 Rs485 Daisychain Wiring: Controller At One End - Honeywell ACUIX Installation And Configuration Manual

Setting the RS485 Control Data Termination (SW1)

Control equipment
Document 800-05662 Rev C
06/10
ACUIX™ PTZ High Speed Analog Dome Installation and Configuration Guide
About RS485 Termination
Caution For the RS485 daisychain wiring, the data cable shield should be carried
through all units by connecting the cable shields together. Connect the
cable shield at the control unit.
RS485 communication is terminated using switch SW1, located near terminal strip J1,
pin 3.
One pair of shielded twisted pair RS485 wire or one pair of unshielded twisted pair wire
can be used for RS485 data.
• Two domes can be home run connected to each control output with both domes
terminated. This is a daisychain with two domes and on control output in the middle.
• The data lines can be daisychain wired (see
control output. Daisychain wiring consists of up to 32 domes per data run with the
control output at one end of the run or in the middle of the run.
• If the control output is at the end of the data run, the last dome on the end of the
data run must be terminated and all intermediate domes unterminated.
• If the control output is in the middle of the data run, the last dome on both ends
must be terminated, and all intermediate domes unterminated.
Note Each RS485 port on the HDCC8TP must be treated individually as if each one
is on a separate piece of equipment.
Figure 3-3 RS485 Daisychain Wiring: Controller at One End
SW1 OFF
Dome 1
Not terminated
Figure 3-3 and Figure
SW1 OFF
Domes 3 to 31
Not terminated
Dome 2
Not terminated
3-4) from the
SW1 ON
Last dome
Terminated
37