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參數資料
| 型號： | PC-COM4 |
| 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： | 6/20頁 |
| 文件大?。?/td> | 492K |
| 代理商： | PC-COM4 |
2192-09197-000-000
Page 6
J606 PC-COM4
CONTROL SYSTEMS
LK25, 26 Channel A Mode Links
(Default positions marked with +).
LK28-30,33 Channel Interrupt Links
LK28-30,33
are the interrupt select links for channels D to A respectively. The possible IRQ
lines available are IRQ3, 4, 5, 7, 9, 10, 11, 12 and 15. Note that it is only possible to use IRQ
lines 10, 11, 12 and 15 when the PC-COM4 is inserted in a 16 bit ISABUS slot. (Default links
are: LK29 position 4, LK28 position 3, LK33 position 11, LK30 position 10.)
See section on Interrupts above.
If any link is in position OR, then that channels IRQ is ORed with all the other channels with
links in the same position and passed to the shared interrupt link LK35. (See later for
description.)
LK31 Channel Enable Link
LK31
is used to enable each of the channels. Fit a link to enable the addressing of a channel,
omit it to disable. (Default is all enabled.)
LK34 OPtion Link
LK34 – Option Link
CD1
CD0
AB1
AB0
X
X
Omit
Omit
X
X
Omit
Fit
X
X
Fit
Omit
X
X
Fit +
Fit +
Omit
Omit
X
X
Omit
Fit
X
X
Fit +
Omit +
X
X
Fit
Fit
X
X
For more information see the I/O Map section above. (Default positions marked with +).
LK35 Shared Interrupt Link
LK35 is the shared interrupt link. Any channel whose IRQ link is selected at position O OR R
will be ored together and passed to this link. This link can then be set for any of the positions
3, 4, 5, 7, 9, 10, 11, 12 or 15 or
Disabled
. The default position is
Disabled
.
LK36 Address Link
L LK K3 36 6 is the address decode link. The desired user base address is set on this link. Note
that if two channels are configured to use the user address then this defines the base address
of a 16 byte access window in the I/O space and can be set on any 16 byte boundary from
000h to 3F0h; if four channels are configured to use the user address link A4 is ignored: LK36
defines a 32 byte window on any 32 byte boundary from 000h to 3E0h. (Default LK36 setting
is for base address of 180h.)
See I/O Map section above.
LK25
A
B
B+
LK26
A
A
B+
Mode
Comment
RS422 Point-point
RS422 Multi-drop
RS485
Transmit on B-TXB, Receive on B-RX
Transmit on B-TXB, Receive on B-RX
Transmit and Receive on B-TXB
Channel Address Mapping
Chan A
Chan B
COM1
COM2
COM 2
COM 3
COM 3
COM 4
Variable Base Address
X
X
X
X
X
X
X
X
Chan C
X
X
X
X
COM 1
COM 2
COM 3
Variable Base Address
Chan D
X
X
X
X
COM 2
COM 3
COM 4
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