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W&T
W W W . W u T . D E
Please see the following table for an explanation of the operating mode DIP switch:
Termination
For all RS485 operating modes it is essential that the bus system be terminated with a termination network which
assures a defined rest state in the high-impedance phases of bus operation.
The bus system can be connected to a termination network by closing switches #6 and #7:
120
Ω
+5V
SW6
SW7
Data In B
Data In A
330
Ω
330
Ω
Applications
RxD A (-)
RxD B (+)
TxD A (-)
TxD B (+)
CTS A (-)
CTS B (+)
RTS A (-)
RTS B (+)
RS422
de
vice
RS422 hardware handshake application
Data Out A
Data Out B
Data In A
Data In B
Handshake Out A
Handshake Out B
Handshake In A
Handshake In B
RS422/485 interface
PC with 13601
1
6
2
7
3
8
4
9
Data Out A
Data Out B
Data In A
Data In B
Handshake Out A
Handshake Out B
Handshake In A
Handshake In B
RS422/485 interface
PC with 13601
1
6
2
7
3
8
4
9
RxD A (-)
RxD B (+)
TxD A (-)
TxD B (+)
RxD A (-)
RxD B (+)
TxD A (-)
TxD B (+)
RS485
de
vice
RS485
de
vice
RS485 4 wire bus master application
Bus A (-)
Bus B (+)
Bus A (-)
Bus B (+)
RS485
de
vice
RS485
de
vice
RS485 2 wire application
Data Out A
Data Out B
Data In A
Data In B
Handshake Out A
Handshake Out B
Handshake In A
Handshake In B
RS422/485 interface
PC with 13601
1
6
2
7
3
8
4
9
PC card 2 x RS422/485
#13601
operating mode
SW1 SW2 SW3 SW4 SW5
RS422, RS485, 4 wire bus master, DTR handshake
OFF
OFF OFF ON
OFF
RS422, RS485, 4 wire bus master, RTS handshake
OFF
OFF OFF OFF ON
RS485, 4 wire / 2-wire with echo, DTR control
OFF
OFF ON
ON
OFF
RS485, 2-wire without echo, DTR control
ON
OFF ON
ON
OFF
RS485, 4 wire / 2-wire with echo, RTS control
OFF
OFF ON
OFF ON
RS485, 2-wire without echo, RTS control
ON
OFF ON
OFF ON
RS485, 4 wire / 2-wire with echo, automatic control
OFF
ON
OFF ON
OFF
RS485, 2-wire without echo, automatic control
ON
ON
OFF ON
OFF
SW8 has
no function
