Local Area Network: Rs-485 Serial Port - Acroprint Data Collection Terminal DC7000 Hardware Manual

Local Area Network: RS-485 Serial Port

The RS-485 serial port is located on the lower left corner of the
terminal. It is a six position 6-pin female port with the outer 2 pins to
Ground. It will accept a male RJ-11 modular connector.
The terminal can use RS-485 2-wire serial communication, allowing up
to 32 terminals to be connected to one host port. An RS-232 port on the
host is typically used in conjunction with an RS-232/RS-485 converter
to complete the connection.
Through software, the host can communicate with individual terminals
even though they are wired in parallel. RS-485 communication uses a
differential bus, which provides good protection from interference over
long runs of up to 4000 feet.
NOTE: When wiring a network, always follow the electric wiring
codes in your area. Typically, a Teflon coated wire is required for
wiring through the ceiling. The "Daisy Chain" cabling between
junction boxes shown on the opposite page is a Teflon jacketed cable.
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