AC37 High-Speed Communication Adapter Card
iii
TABLE OF CONTENTS
Welcome.................................................................................................. v
About This Manual ......................................................................................................................... v
Document Conventions ................................................................................................................ v
AC37: IBM AT to Remote Bus Adapter Card ...................................... 1-1
Summary of Features: ................................................................................................................ 1-1
Address Selection: ....................................................................................................................... 1-2
Host CPU Interrupt Request Line Selection: ....................................................................... 1-3
RS-485 Serial Line Termination and Biasing: .................................................................... 1-4
Examples: ....................................................................................................................................... 1-4
Installation: ................................................................................................................................... 1-5
Cable: .............................................................................................................................................. 1-5
Connector Pin Assignments ..................................................................................................... 1-5
Option Jumpers ............................................................................................................................ 1-6
Register Definition ............................................................................... 2-1
T
RANSMIT
B
UFFER
R
EGISTER
: ....................................................... O
FFSET
0 - W
RITE
O
NLY
2-1
R
ECEIVE
B
UFFER
R
EGISTER
: ........................................................... O
FFSET
0 - R
EAD
O
NLY
2-1
C
ARD
I
DENTIFICATION
R
EGISTER
: ................................................... O
FFSET
7 - R
EAD
O
NLY
2-1
B
AUD
R
ATE
S
ELECT
R
EGISTER
...................................................... O
FFSET
0 - R
EAD
/W
RITE
2-2
I
NTERRUPT
E
NABLE
R
EGISTER
: ...................................................... O
FFSET
1 - R
EAD
/W
RITE
2-3
I
NTERRUPT
I
DENTIFICATION
R
EGISTER
: ........................................... O
FFSET
2 - R
EAD
O
NLY
2-4
R
ESET
C
ONTROL
R
EGISTER
: ........................................................... O
FFSET
2 - W
RITE
O
NLY
2-5
L
INE
C
ONTROL
R
EGISTER
: ............................................................. O
FFSET
3 - R
EAD
/W
RITE
2-6
M
ODEM
C
ONTROL
R
EGISTER
: ....................................................... O
FFSET
4 - R
EAD
/W
RITE
2-7
L
INE
S
TATUS
R
EGISTER
: ................................................................. O
FFSET
5 - R
EAD
O
NLY
2-8
M
ODEM
S
TATUS
R
EGISTER
: ........................................................... O
FFSET
6 - R
EAD
O
NLY
2-9
External Interrupt Line, Remote I/O IRQ ............................................. 3-1
Modes of Operation ............................................................................ 4-1
Mode 0: .................................................................................................................................. 4-1
Mode 1: .................................................................................................................................. 4-1
Mode 2: .................................................................................................................................. 4-2
Mode 3: .................................................................................................................................. 4-2
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