Adeunis RF ARF35 Посібник користувача - Сторінка 5
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Друкувати сторінкуSERIAL LINK WIRING
• MODEM / DTE RS232
This is for example the case of a modem connected to a PC
• DCE RS232
This is for example the case of a modem connected to a measuring device.
• RS485 wiring
The RS485 link needs to be adapted (each side). The modem includes a 100Ω termination
resistor:
•
Jumper mounted, the resistor is connected between A and B (respectively RX+ and RX-)
•
No jumper, the resistor is not connected between A and B
If the modem is ending the RS485 bus, the jumper must be mounted.
The RS485 bus wiring needs only two wires for the PCB revision B (ARF7120/B) or
greater. For the PCB revision A (ARF7120/A), the TX+ (respectively TX-) and RX+
(respectively RX-) MUST be connected together by the USER.
06-06-V6-smn
N° / SUB-D 9
N O M
+ Vcc
5
G ND
2
RXD
3
T XD
N ° / SUB -D 9
N O M
+ Vcc
5
G N D
3
RXD
2
T XD
B' / Z
T
Rt
A' / Y
B
R
A
Network termination 485
BUS RS485
NAM E
+ Vcc
GND
A
TX+/RX+
B
TX-/ RX-
Connect only TX-
or RX- (note 1)
Note 1:
TX- is connected to RX- on the PCB
TX+ is connected to RX+ on the PCB
Figure 1: RS485 wiring, PCB marked ARF7120/B or greater
+
IN H IB
-
RTS
RX
TX
C TS
TX+
TX-
RX+
RX-
+
IN H IB
-
RTS
RX
TX
C TS
TX+
TX-
RX+
RX-
RS485 Network
Z / TX-
T
100 Ω
Y / TX+
Jumper
B / RX-
R
A / RX+
MODEM
PCB revision B or greater
+
INH IB
-
RTS
Connect only TX+
RX
or RX+ (note 1)
TX
CTS
TX+
TX-
RX+
RX-
jumper
p5