EZT-570S User Manual
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A maximum of 31 chambers can be linked together on a single EIA-485 link. When connecting
multiple chambers together, do not run separate cables from the PC to each chamber. Follow the
diagram below for proper connections. Running multiple connections from the host PC will degrade
the signal and could prevent communications from operating correctly.
Either RJ-11 connector on the chamber can be used for the connection from or to another
chamber. There is not a designated “in” and “out” connection. Keep the communication
wires as short as possible between chambers. The total length adds up quickly, and longer
runs will degrade performance. Maximum recommended total length is 350 feet, but is by no
means guaranteed. The total length depends on many factors including the quality of wire
used, the number of chambers on the link and the presence of electrical equipment in the
area that may generate electrical interference.
For longer runs and when multiple chambers are used on the same link, a line terminator
may be required at the end of the cable run. This is typically a 220 ohm resistor connected
across the A and B terminals of the last chamber on the link. See the manufacturer’s
instructions for your specific EIA-485 communications interface used with your PC for any
requirements that they may have to be followed.
Hold the RJ11 connector in your hand, tab side
down, with the cable opening towards you. The
pins are numbered 1-6, from right to left:
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