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參數(shù)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(shù)： | 2/20頁 |
| 文件大?。?/td> | 492K |
| 代理商： | PC-COM4 |
Description
The PC-COM4 uses a quad 16C550 type UART device to provide the four communications
channels. The 16C550 device is the standard type of UART used on PC AT type machines and
is supported by a wide range of third party software.
Two channels on the PC-COM4 (channels A and B) can either be configured as RS323 or
RS422/485. When configured as RS422/485 these are independently electrically isolated from
the ISABUS bus and can be configured for either RS422 type communications or RS485 type
communications. When configured for RS232 these channels offer all the signals found on a
PC AT type 9-pin RS232 port.
Similarly, the other two channels (CandD) are configured as RS232, supporting all the signals
found on a PC AT type 9-pin RS232 port.
A flexible addressing system allows the four channels to be mapped into the standard PC AT
communications channel addresses for COM1-4. Alternatively, pairs of channels can be
mapped into any I/O location from 000-3FFh. See later for more details of address mapping.
Each channel has its own interrupt line that can be linked to any of the following ISABUS
Interrupts IRQ3-5, 7, 9-12, 15. Additionally, interrupts from any combination of channels may
be ORed together to produce a single interrupt to any of the above signals.
The PC - COM4 has a 16 bit ISABUS connector but utilises only interrupt lines IRQ10, 11, 12
and 15 on the 16-bit part of the ISABUS connector. This means that the board can also be used
in an 8 bit ISABUS slot providing that these interrupt lines are not required.
I/O Map
The PC-COM4 has a flexible addressing system that allows the channels A, B, C and D to be
addressed at the fixed PC locations for COM1, COM2, COM3 and COM4, or allows them to be
addressed using the user base address link LK36:
2192-09197-000-000
Page 2
J606 PC-COM4
CONTROL SYSTEMS
3F8-3FFh
3E8-3EFh
2E8-2EFh
2F8-2FFh
COM1
COM3
COM4
COM2
Fixed PC AT Addressing
C
A
Channel
D
Channel
B
3F0h
000h
A
Channel
B
Channel A and B
3F0h
000h
C
Channel
D
LK1
Base
Address
Channel C and D
Variable Base Address
3E0h
000h
LK1
Base
Address
Channel A, B, C and D
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| PCC-OST-T | 制造商:Newport Electronics Inc 功能描述:CONNECTOR, For Use With:Standard Circuit Board, Accessory Type:Circuit Board Standard Connector, Connector Mounting:PCB, Connector Type:Thermocouple, No. of Contacts:2, Series:PCC, Thermocouple Type:T , RoHS Compliant: NA |
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