Look RS232 > RS232C Hardware  
  Table of Registers
Base Address DLAB Read/Write Abr. Register Name
+ 0 =0 Write - Transmitter Holding Buffer
=0 Read - Receiver Buffer
=1 Read/Write - Divisor Latch Low Byte
+ 1 =0 Read/Write IER Interrupt Enable Register
=1 Read/Write - Divisor Latch High Byte
+ 2 - Read IIR Interrupt Identification Register
- Write FCR FIFO Control Register
+ 3 - Read/Write LCR Line Control Register
+ 4 - Read/Write MCR Modem Control Register
+ 5 - Read LSR Line Status Register
+ 6 - Read MSR Modem Status Register
+ 7 - Read/Write - Scratch Register
 
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