![Emerson AXIMA 2000 Скачать руководство пользователя страница 29](http://html.mh-extra.com/html/emerson/axima-2000/axima-2000_installation-manual_102048029.webp)
20
AXIMA 2000/4000 Installation Manual
RS485 Mode
RS422 and RS485 modes are similar because they both use
differential drivers and receivers. RS485 mode adds the ability to
enable and disable the receivers and transmitters as required for
multidrop installations. See Figure 13, RS422 Wiring Diagram, on
page 21.
The enable and disable operations of the AXIMA 2000/4000
controller serial port can be selected to operate in two different
transmission methods. These methods are selectable with a DIP
switch behind the access panel on the top front of the controller. It is
labeled, SD (Send Data) or RTS (Ready to Send). See Figure 16, COM
2, RS485 Configuration, on page 24.
SD (Send Data) Method: This is the simplest mode. Whenever the
AXIMA 2000/4000 controller serial port senses that data is present
the transmitter is enabled. The transmitter stays enabled long
enough to assure the last bit has been sent then is disables or tri-
states the transmission. It does this for baud rates down to 9600
baud. The transmitter is in tri-state mode or disabled when data is
not being sent so it can receive data.
RTS (Ready to Send) Method: This method enables the
transmitter under two conditions.
1. When a particular AXIMA 2000/4000 controller has been
chosen by the host to be online, the command, CTRL A - “Axis
ID #” - Enter, is issued. The transmitter stays enabled until a
“CTRL B” command is received.
2. When the AXIMA Software Application executes an Open Com
Instruction, the transmitter is enabled. The transmitter goes
back to tri-state mode when a Close Com Instruction is issued.
See the AXIMA Software User’s Guide (P/N 400263-00) for more
information.
The Echo On/Off DIP switch controls the enable/disable function of
the AXIMA receiver. With the switch “On”, the receiver is always
enabled. This switch should be “On” for RS422 and RS485 four wire
operation. With the switch “Off”, the receiver is disabled whenever
the transmitter is enabled. This is needed for two wire mode. This is
to prevent the AXIMA 2000/4000 from receiving the same characters
it just transmitted.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Содержание AXIMA 2000
Страница 3: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...
Страница 7: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...
Страница 13: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...
Страница 23: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...
Страница 59: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...