Contec BX-955SD-DC6000 User Manual page 81

6. Appendix
Table 6.6. Function of Each Register < 4 / 4 >
I/O address
03FEH
MSR : Modem Status Register
D7
DCD
DCD
03FFH
SCR : Scratchpad Register
This is an 8-bit, readable/writable register which is available to the user to
allow data to be saved temporarily.
74
Description
D6 D5 D4 D3 D2
RI DSR CTS
DDCD TERI DDSR DCTS
Delta data carrier detect
CTS
DSR
RI
D1 D0
Delta CTS
Delta DSR
Trailing edge RI
BX-955Sx Series User's manual