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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)： | 9/20頁 |
| 文件大小： | 492K |
| 代理商： | PC-COM4 |
Page 9
2192-09197-000-000
J606 PC-COM4
CONTROL SYSTEMS
Software Considerations
RS422 point-point does not require any special consideration within the software other than
that hardware handshaking is obviously not possible. If flow control is required, it must be
implemented by software such as the use of the XON/XOFF protocol.
RS422 multi-drop and RS485 configurations need careful control of the RTS signal from the
UART which is used to enable the transmitter on the differential pair.
RTS needs to be asserted prior to the beginning of the first start bit of the first transmitted
character transmitted from the UART and needs to be disabled after the last stop bit of the last
character has actually been transmitted from the UART.
The opto-isolation on the PC-COM4 has a fixed delay from RTS becoming active on the UART
to the line driver switching ON of approximately 2 microseconds. A delay must be added before
loading the first character into the UART transmit buffer to ensure that the driver is ON.
After a character has been transmitted on the UART, it is possible to monitor the TEMT
(Transmitter Empty) bit of the Line Status register. Only after this has become asserted is it
valid to negate the RTS signal.
Reception of a Transmit Buffer Empty interrupt is not a
valid condition for negating RTS. The output shift register of the UART is still active until
the TEMT bit is set.
Using Channels A and B in RS232 mode
Channels A and B can be used as normal RS232 ports by appropriately configuring links LK1-
9,32 for channel B and LK10-18,27 for channel A.
Using the RS232 Channels - C & D
The RS232 channels on the PC-COM4 are of a standard implementation providing for all of the
standard signals available on a nine way RS232 interface.
Address and Interrupt Selection
The I/O address of channels C and D must first be configured, together with the interrupt line
for each channel. You will need to refer to the documentation on your CPU card to establish
spare I/O and interrupt channels to use.
Then refer to the I/O Map, Interrupts and Links section of this manual to configure the
appropriate links.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCC-OST-E | 制造商:Newport Electronics Inc 功能描述:CONNECTOR, For Use With:Standard Circuit Board, Accessory Type:Circuit Board Sta 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:E , RoHS Compliant: NA |
| PCC-OST-K | 制造商:Newport Electronics Inc 功能描述:CONNECTOR, For Use With:Standard Circuit Board, Accessory Type:Circuit Board Sta 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:K , RoHS Compliant: NA |
| 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 |
| PCCOV19001BK1 | 功能描述:機(jī)架和機(jī)柜配件 WIRE MANAGER COVER 1U RoHS:否 制造商:Bivar 產(chǎn)品:Rack Accessories 面板空間: 顏色:Black |
| PCCOV19003BK1 | 功能描述:機(jī)架和機(jī)柜配件 WIRE MANAGER COVER 2U RoHS:否 制造商:Bivar 產(chǎn)品:Rack Accessories 面板空間: 顏色:Black |
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