Athena 16C series, Руководство пользователя

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12
Digital
Communications
Option
Remote Communications Options
RS-232
This method allows bidirectional data transfer via a three-
conductor cable consisting of signal ground, receive input and
transmit output. It is recommended for communication distances
less than 50 feet between the computer terminal and the instru-
ment. Note: Multiple instruments cannot be connected to the same
port.
The RS232 port is optically isolated to eliminate ground
loop problems. Typically, “Data Out” of the computer/
terminal connects to the “RCV” terminal. “Data In” connects to the
“XMT” terminal. If shielded cable is used, it should be connected to
the frame ground at one end only. Signal ground is to be connected
at appropriate ground terminals (refer to wiring diagram on next
page).
RS-422
This method allows bidirectional data transfer via a four-
wire conductor cable for distances over 50 feet between
the computer terminal and the instrument. A signal ground
wire is not required.
RS-485
The RS485 multipoint capability allows up to 32 controllers to be
connected together in a half-duplex network or up to 100 con-
trollers with an appropriate communications repeater.
Three remote commu-
nications options are
available for the 16C
which allow interfacing
to remote devices
utilizing the most
common industry
standards: RS232,
RS422, and RS485.