Korenix JetCon 1100 Series, Руководство пользователя

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12
Connecting RS-422/ RS-485 Interface
The RS-422/ RS-485 interface only presented in JetCon 1201 and JetCon 1201i-3KV. Both of
model support RS-422 and RS-485 serial communication ability in 5-pin removable terminal
block connector. The RS-422/ RS485 communication does not support flow control /
hand-shaking; therefore, the recommended connecting diagram and DIP-Switch setting show
as below.
JetCon 1200 Serial Mode Select DIP-Switch
DIP-SW1 DIP-SW2 DIP-SW3 DIP-SW4 Serial Mode and Description
OFF OFF -
ON ( with T.R. )
OFF (without T.R.)
RS-422 4-Wire Serial Mode+ DIP-SW4 (120ohm line terminator resistor
selection)
ON OFF -
ON ( with T.R. )
OFF (without T.R.)
RS-485 4-Wire Serial Mode + DIP-SW4 (120ohm line terminator resistor
selection)
OFF ON OFF
ON ( with T.R. )
OFF (without T.R.)
RS-485 2-Wire Serial Mode without ECHO + DIP-SW4 (120ohm line
terminator resistor selection)
OFF ON ON
ON ( with T.R. )
OFF (without T.R.)
RS-485 2-Wire Serial Mode with ECHO + DIP-SW4 (120ohm line terminator
resistor selection)
Note: Before mounting the JetCon1200 series, please setting the DIP-Switch first.
It is recommended to enable the 120 ohm line terminaltor, in case the connection distance is
too short or signal is not stronger to offer a stable signale, then the wiring need install a 120
ohm line terminator onto the one node of the wire that cross TX+ and TX-, and RX+ and RX-. In
the JetCon 1200 series, the system embedded 120ohm lne terminators and just click on the DI
Switch to occupy the resistor on the 1
st
and last node of RS-422 serial bus.
The following diagram is 4-wire RS-485 wiring architecture in full duplex communication mode.
It is similar as RS-422 4-wire, and the network is connected so that the master node
communicates to all slave nodes. All slave nodes communicate only with the master node.
RS-422 4-wire communication mode