67
W&T
Serial PCI cards
Subject to error and alteration
The DIL switch mode settings are shown in the following table:
Terminating
All RS485 modes require terminating the bus system with a ter-
mination network which ensures a defined rest state in the tris-
tate phases of bus operation. The bus system can be connected
to a termination network on the PC card by closing DIL swit-
ches 6 and 7:
+5V
SW6
SW7
Data In B
Data In A
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
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