Publication No. 500-657055-000 Rev. G
Handling and Installation 23
1.5 Switch S1
Figure 1-3 Location of Switch S1
NOTE
To configure the serial ports to loopback mode, S1 on the VMICPCI-7055/CPCI-7055RC will need pins 6
and 8 (relating to COM1 and COM2 respectively) placed in the ON position when used with the VMIACC-
7055/ACC-7055RC Rear Transition Modules (RTMs).
Table 1-4 CompactPCI Bus Switch S1 Configuration (Factory Default is “OFF” for All Positions)
Pin#
Position
Function
1
On
Boot from solder-down Flash (64 Mbyte)
Off
Boot from PLCC32
2
On
Write protect all NVRAM and I
2
C bus
Off
No write protection for NVRAM on I
2
C bus
3
On
Write protect all NVRAM on DEVbus
Off
No write protection for NVRAM on DEVbus
4
On
COM Port 0 loopback
Off
COM Port 0 normal
5
On
COM Port 1 (COM1) RS422/485 mode
Off
COM Port 1 (COM1) RS232 mode
6
On
COM Port 1 loopback
Off
COM Port 1 normal
7
On
COM Port 2 (COM2) RS422/485 mode
Off
COM Port 2 (COM2) RS232 mode
8
On
COM Port 2 loopback
Off
COM Port 2 normal
S1
O
FF
O
FF
O
FF
O
FF
O
FF
O
FF
O
F
FO
FF
1
2
3
4
5
6
7
8
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
1
2
3
4
5
6
7
8
