Contec BX220 Series - Page 85

6. Appendix
76
BX-220 User’s manual
Table 6.3. Function of Each Register < 4 / 4 >
MSR : Modem Status Register
D7 D6 D5 D4 D3 D2 D1 D0
03FEH
I/O address Description
SCR : Scratchpad Register
03FFH
DCD RI DSR CTS
DDCD
TERI
DDSR
DCTS
Delta CTS
Delta DSR
Trailing edge RI
Delta data carrier detect
CTS
DSR
RI
DCD
This is an 8-bit, readable/writable register which is available to the user to
allow data to be saved temporarily.