Compaq Contec COM-2(PC)F - Manual (Page 61)

Appendix
COM-2(PC)F
52
Sample Program 8
[Half-duplex data transmission (Enhanced mode)]
The sample program 8 enables initialization on ACE, data
transmission in the transmission mode, and waits for the receive
data in the receive mode.
1 Note: Wait Time = (sec)
Data Length
Baud Rate
No
Yes
1
Line Status
D6 bit = 1
No
Transmit end
Yes
Modem Control
RTS to High
Set Baud Rate
Generator
1
1
Set Interrupt Enable
Register
Set Transmission Format
(Line Control Register)
WAIT Time
(After Initialization)
Set Modem
Control Output
Read
Line Status Register
Read
Interrupt ID Register
Read
Modem Status register
Modem Control
RTS to LOW
Read
Received Data Register
Data Transmission
5 bytes Tramsmit
Line Status
D0 bit = 1
Display Receiver Buffer's
Data 0n CRT
5 bytes Receive
START
END
No
Yes
No
Yes
No
Yes
Figure 6.10. Flowchart of Sample Program 8