Hardware Reference Manual
421 Intelligent Serial, 8-Port
Ground is available on the front panel connector on pins 9, 27, 43 and 61.
4.2 Front Panel Connector
The front panel connector is a high density SCSI Female connector, AMP part number AMP-796055-1.
4.3 DIP Switches
4.3.1 RS485 Support (SW2-SW5)
These switches are used when running a port in RS485 signaling mode. When running RS485, the two switches
associated with the port should be
Closed
.
In all other signaling modes, the switches should be
Open
(see the
table below for port/switch position assignments).
Note
:
The use of RS485 requires use of the correct software interface. Consult the driver
manual for the operating system used for details.
All switches are in the
Open
state when shipped from the factory.
1
S
W
5
4
3
2
4
S
W
4
3
2
4
1
S
W
2
S
W
3
3
2
4
1
3
2
1
O
O
O
O
Switch Pack
Switch Number Port
SW2 1
0
SW2 2
0
SW2 3
1
SW2 4
1
SW3 1
2
SW3 2
2
SW3 3
3
SW3 4
3
SW4 1
4
SW4 2
4
SW4 3
5
SW4 4
5
SW5 1
6
SW5 2
6
SW5 3
7
SW5 4
7
DDC No. Rx-URMH 002 Rev -
Issued 12 November 2002
15 of 19
