CHAPTER 1: INSTALLING THE PCI-AC48 ADAPTER CARD
PCI-AC48 User’s Guide
5
5
DIP Switch Descriptions
DIP Switch Settings for Common Network Configurations
Settings suitable for common applications of the PCI-AC48 adapter card are shown in the table
below. You need to know where the adapter card will be installed on the network—at one end or in
the middle—and whether 2-wire or 4-wire connections are used.
Switch
Description
1
Bias: RS-485 – (pull down)
2
Bias: RS-485 + (pull up)
3
Interrupt: IRQ –
4
Interrupt: IRQ +
5
Termination: IRQ, 200
6
Termination: RS-485, 200
6
Not used
5
4
3
2
Enable or disable 4-wire mode. When 4-wire mode is enabled, port A is TX
and port B is RX.
1
Turn
ON
or
OFF
all LEDs on adapter card.
1
1) This DIP switch overrides the functionality of the LEDs and is useful for verifying LED indicator operation.
LEDs are shown in the diagram below:
S1 (port A)
or
S2 (port B)
123
456
OFF
S3
123
456
OFF
Serial Port A
Po
rt B IRQ (Red)
Serial Port B
Po
rt B R
X
(G
reen)
Po
rt B
TX
(G
reen)
Po
rt A IRQ (Red)
Po
rt A R
X
(G
reen)
Po
rt A
TX
(G
reen)
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
