Laurel-electronics Custom ASCII Protocol For Laureate Series 2 Digita Manual do Utilizador Página 8

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8
Ethernet-to-RS485 Device Converter Board
& USB-to-RS485 Device Converter Board
Full Duplex Operation
No jumpers for short cable runs.
Add b & d for long cable runs.
Half Duplex Operation
a & c - Installed for half duplex operation.
d - Installed on last meter in line with long cable runs.
3. CONNECTOR WIRING, SERIAL BOARD TO COMPUTER
N/C
ISO GND
RX
TX
RTS
N/C
GND
TX
RX
RTS
RS232 INTERFACE Computer
6
5
4
3
2
1
ISO GND
BRX
ARX
ATX
BTX
ISO GND
GND
BTX
ATX
ARX
BRX
GND
RS485 INTERFACE - FULL DUPLEX
GND
ATX / ARX
BTX / BRX
GND
RS485 INTERFACE - HALF DUPLEX
1
2
3
4
5
6
7
8
(A') RXD0 -
(B') RXD1 +
(B) TXD1 *
(A) TXD0 -
ISO GND
TXD0
TXD1
RXD1
RXD0
GND
RS485-MODBUS - FULL DUPLEX RS485-MODBUS - HALF DUPLEX
(B) TX / RXD1
(A) TX / RXD0
ISO GND
(B) TX/RXD1
(A) TX/RXD0
GND
6
5
4
3
2
1
6
5
4
3
2
1
ISO GND
ATX / ARX
BTX / BRX
ISO GND
1
2
3
4
5
6
7
8
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