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參數(shù)資料
| 型號： | PCSER4 |
| 英文描述： | PC(ISA)BUS I/O CARD |
| 中文描述： | 電腦（ISA）總線的I / O卡 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大小： | 285K |
| 代理商： | PCSER4 |
2192-09375-000-000
J228 PCSER4
Page 7
Links
Default Link Positions
Link Position Diagram (Default Base Address = 180H)
Address Links LKA9-LK1
Links LKA9-LKA1
Links LKA9 to LKA1 correspond to the address lines within the PC. This allows the user to set the
board on any even two byte boundary. Making a link sets the address line high, hence the default
link setting LKA8 and LKA7 made gives the address 180H. All the address links are grouped
together at the top left-hand corner of the board with the exception of LKA1 which will be found
close to the ISAbus connector and IC17.
+ Indicates link fitted.
There are four functions defined by links on the PCSER4: whether the serial lines are RS232 or
RS485/422 (and how some of them are connected); where the interrupts go to on the PC;
synchronous clock sourcing; and receiver enabling/disabling.
The first of the link number refers to the serial channel, as defined in the I/O map. Thus LK13 refers
to channel 1. The links define whether some of the lines connecting to the SCC for that channel
are at RS232 or RS485/422 levels, and in some cases which lines go to the 50-way
connector.(Refer to the table below). The reason why some lines on the 50-way connector change
function is because RS485/422 is a differential (2-wire) system, whereas RS232 is single-ended
and uses one wire per function.
Some of the serial lines are not affected by these links. This is either because they have a
connection on the 50-way connection, which is not shared with a different function or level, or
because the device can operate at either level.
L
L
L
L
L
L
TP3
TP1
LK14A
LK24A
A B
A B
A B
LK34A
LK44A
L
L
L
L
L
L
A B
A B
A B
TP2
L
L
Address line:
Hex value:
Address link:
Default base:
A9
2
LKA9
-
A8
1
LKA8
+
A7
8
LKA7
+
A6
4
LKA6
-
A5
2
LKA5
-
A4
1
LKA4
-
A3
8
LKA3
-
A2
4
LKA2
-
A1
2
LKA1
-
A0
1
-
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