Advantech 4-Port RS-232 Interface card PCL-849 - Manual (Page 17)

1 8 PCL-849 User's Manual
switch S1 designates the card's interrupt status register address, as
shown in the following figure and table.
Interrupt Status Register S1
Bit
Function
0 Port 1
1 Port 2
2 Port 3
3 Port 4
4 Not Used
5 Not Used
6 Not Used
7 Not Used
The user may change the interrupt status register address via S1.
Please note that the address decoder will occupy a continuous, 16-byte
area related to the switch setting. For example, if you set the switch to
210H, then the address 210H to 21FH will all be decoded. The
various DIP switch settings (S1) for the interrupt status register are as
shown in the table opposite.