PCI Photon 8 Port RS232 Software Installation
Chapter 3 Page 12
PCI Photon 8 Port RS232 Users:
card 1 is on bus 0, device 16, function 0
Card ID=2, revision 3: Photon 8 Port RS232
interrupt line IRQ11 has been assigned
8 sets of 16550-compatible registers are at Bank I/O address FF40
SISR is at I/O address FFA0
Baud clock control is at I/O address FFC0
Write 0xf6 for /8 (default), 0xf2 for /4, 0xd6 for /2, 0xd2 for /1.
Note the IRQ, I/O address and SISR Address values
In our example:
The IRQ = 11
The IRQ is the interrupt line shared amongst the Photon 8 Port
RS232 card’s serial ports
The Bank address = FF40
The Bank address determines the COM Port Base addresses in the
following manner:
COM Base of port 1 = the Bank Address
COM Base of port 2 = the Bank A 8hex
COM Base of port 3 = the Bank A 10hex
COM Base of port 4 = the Bank A 18hex
COM Base of port 5 = the Bank A 20hex
COM Base of port 6 = the Bank A 28hex
COM Base of port 7 = the Bank A 30hex
COM Base of port 8 = the Bank A 38hex
The SISR Address = FFA0
The SISR Address is the Shared Interrupt Status Register, this is a
read-only register indicating which of the four serial ports requires
service by the driver software.
