|
Table
of
Content
5
5
‐
6
Programming
RS
‐
485
...........................................................................
51
5
‐
6
‐
1
Initialize
COM
port
.......................................................................
51
5
‐
6
‐
1
Send
out
one
character
(Transmit)
..............................................
51
5
‐
6
‐
2
Send
out
one
block
data
(Transmit
–
the
data
more
than
two
characters)
....................................................................................................
52
5
‐
6
‐
3
Receive
data
.................................................................................
53
5
‐
6
‐
4
Basic
Language
Example
..............................................................
53
Chapter
6
Technical
Reference
.............................................................................
54
6
‐
1
Trouble
Shooting
for
Post
Beep
and
Error
Messages
...........................
54
6
‐
1
‐
1
POST
BEEP
....................................................................................
54
6
‐
1
‐
2
CMOS
BATTERY
FAILURE
..............................................................
54
6
‐
1
‐
3
CMOS
CHECKSUM
ERROR
............................................................
54
6
‐
1
‐
4
DISK
BOOT
FAILURE
......................................................................
55
6
‐
1
‐
5
DISKETTE
DRIVES
OR
TYPES
MISMATCH
ERROR
..........................
55
6
‐
1
‐
6
ERROR
ENCOUNTERED
INITIALIZING
HARD
DRIVE
......................
55
6
‐
1
‐
7
ERROR
INITIALIZING
HARD
DISK
CONTROLLER
............................
55
6
‐
1
‐
8
FLOPPY
DISK
CONTROLLER
ERROR
OR
NO
CONTROLLER
PRESENT
56
6
‐
1
‐
9
KEYBOARD
ERROR
OR
NO
KEYBOARD
PRESENT
..........................
56
6
‐
1
‐
10
MEMORY
ADDRESS
ERROR
..........................................................
56
6
‐
1
‐
11
MEMORY
SIZE
HAS
CHANGED
......................................................
56
6
‐
1
‐
12
MEMORY
VERIFYING
ERROR
........................................................
56
6
‐
1
‐
13
OFFENDING
ADDRESS
MISSING
...................................................
57
6
‐
1
‐
14
REBOOT
ERROR
............................................................................
57
6
‐
1
‐
15
SYSTEM
HALTED
...........................................................................
57
6
‐
2
Serial
Ports
...........................................................................................
57
6
‐
2
‐
1
Receiver
Buffer
Register
(RBR)
.....................................................
58
6
‐
2
‐
2
Transmitter
Holding
Register
(THR)..............................................
58
6
‐
2
‐
3
Interrupt
Enable
Register
(IER)
.....................................................
58
6
‐
2
‐
4
Interrupt
Identification
Register
(IIR)
...........................................
59
6
‐
2
‐
5
Line
Control
Register
(LCR)
...........................................................
59
6
‐
2
‐
6
MODEM
Control
Register
(MCR)
..................................................
59
6
‐
2
‐
7
Line
Status
Register
(LSR)
.............................................................
60
6
‐
2
‐
8
MODEM
Status
Register
(MSR)
....................................................
60
6
‐
2
‐
9
Divisor
Latch
(LS,
MS)
...................................................................
60
Chapter
7
Appendix
..............................................................................................
62
7
‐
1
Notes
....................................................................................................
62