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参数资料
| 型号： | USB-COM422-PLUS2 |
| 厂商： | FTDI, Future Technology Devices International Ltd |
| 文件页数： | 20/24页 |
| 文件大小： | 0K |
| 描述： | MOD USB HS RS422 CONVERTER 2 CH |
| 产品目录绘图： | USB Module Dual |
| 标准包装： | 1 |
| 系列： | USB-COM-Plus |
| 类型： | USB 至 RS-422 |
| 连接器类型： | 迷你型 B 至 DB9（2 端口） |
| 产品目录页面： | 633 (CN2011-ZH PDF) |
| 其它名称： | 768-1036 USB-COM422-PLUS-2 |
Document Reference No.: FT_000135
USB-COM422-PLUS2 Datasheet
Version 1.2
Clearance No.: FTDI#103
8
Troubleshooting
8.1 Hardware
Cables are the most common sources of trouble with external devices.
Check the following:
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USB cable is properly inserted at both ends
Computer power is ON
Computer is not in Sleep or Standby
If a USB Hub is used, be sure it is set for “Self - Powered” operation
If a USB Hub is used, be sure all cables are properly inserted
If all the above are OK, the Yellow LED should be lit, indicating the device has been recognized by the
USB subsystem.
RS422 cables – check the following:
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Output signals (TXD+, TXD-, RTS+, RTS-) are connected to the respective inputs (RXD+, RXD-,
CTS+, CTS-) in each direction.
Check for specific handshake requirements of your RS422 peripheral.
If handshake signals are not used, ensure the application is set to “No Hardware Handshake”, or
equivalent.
Test the port with a loop-back connector. Connect TXD+ to RXD+, TXD- to RXD-, RTS+ to CTS+ and
RTS- to CTS-. Use a simple terminal program to check that data is transmitted and received.
8.2 Device Driver
Ensure the latest device driver is in use. See www.ftdichip.com
If other devices with FTDI chips are installed in the system, check with all manufacturers of these devices
for the latest device drivers.
See the FTDI installation guides for additional details: http://ftdichip.com/Documents/InstallGuides.htm
Common Windows Device Driver Troubles:
DEVICE TIMES OUT : The default settings of the device driver assume typical data transfers of
hundreds to thousands or more bytes at a given time. Some applications, such as a GPS device,
only send data in short packets, often only a few bytes. If this is the case, it may be necessary
to adjust the driver buffer size and/or latency timer to smaller values. These values can be
adjusted through the Advanced driver options as noted in Figure 2.13. The buffer size can be
reduced to 64 bytes. The latency timer can be set as low as 2ms. A setting of 1ms will cause
unnecessary USB traffic and could adversely affect data transmission.
ERRATIC MOUSE POINTER : The device driver defaults to query an attached device to find out
whether it is a mouse or modem, consistent with native COM port operation. Some RS422
peripherals constantly send short packets of data, causing the host system to “think” a mouse or
modem has been attached. These short packets will interfere with normal mouse operation
causing the pointer to jump around the screen. If this happens, disconnect the RS422 device and
uncheck the Serial Enumerator option, also found on the Advanced driver options screen in Figure
2.13.
COM PORT IN USE : Windows keeps track of all COM port assignments. If multiple FTDIChip
products have been connected to a single system, the COM port number will increase, even if the
other devices are not attached. If the higher COM port assignments are not acceptable for the
application, known unused COM port numbers should be uninstalled according to the FTDI
installation guide: http://ftdichip.com/Documents/InstallGuides.htm .
Copyright ? 2010 Future Technology Devices International Limited
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相关PDF资料 |
PDF描述 |
|---|---|
| USB-COM485-PLUS1 | MOD USB RS485 CONVERTER 1 CH |
| USB-M26FTU | CONN USB MINI B R/A SMD |
| USB-RS422-PCBA | MOD USB RS422 EMBEDDED CONV PCB |
| USB-RS485-PCBA | MOD USB RS485 EMBEDDED CONV PCB |
| USB-SMBUS-CABLEZ | CABLE SMBUS USB 3PIN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| USB-COM422-PLUS-2 | 制造商:Future Technology Devices International (FTDI Chip) 功能描述:USB TO A DUAL INTERFACE RS422 LEVEL SERIAL UART ADAPTOR 制造商:Future Technology Devices International (FTDI Chip) 功能描述:MODULE DEV USB-RS422 2 COM PORT 制造商:Future Technology Devices International (FTDI Chip) 功能描述:MOD, USB HS TO RS422, 2 CH, FT2232H 制造商:Future Technology Devices International (FTDI Chip) 功能描述:MODULE, USB HS TO RS422 CONV, 2 COM PORT, FT2232H; ;ROHS COMPLIANT: YES |
| USB-COM422-PLUS4 | 功能描述:界面模块 USB HS to RS422 Conv Assembly 4 DB9 Ports RoHS:否 制造商:4D Systems 产品:Serial Converters 通道/端口数量: 数据速率: 接口类型:USB, UART 工作电源电压:3.3 V, 5 V 最大工作温度: |
| USB-COM422-PLUS-4 | 制造商:Future Technology Devices International (FTDI Chip) 功能描述:USB TO A QUAD INTERFACE RS422 LEVEL SERIAL UART ADAPTOR 制造商:Future Technology Devices International (FTDI Chip) 功能描述:MODULE DEV USB-RS422 4 COM PORT 制造商:Future Technology Devices International (FTDI Chip) 功能描述:MOD, USB HS TO RS422, 4 CH, FT4232H 制造商:Future Technology Devices International (FTDI Chip) 功能描述:MODULE, USB HS TO RS422 CONV, 4 COM PORT, FT4232H; ;ROHS COMPLIANT: YES |
| USB-COM485-PLUS1 | 功能描述:界面模块 USB to RS485 Convrtr Assembly 1 DB9 Port RoHS:否 制造商:4D Systems 产品:Serial Converters 通道/端口数量: 数据速率: 接口类型:USB, UART 工作电源电压:3.3 V, 5 V 最大工作温度: |
| USB-COM485-PLUS-1 | 制造商:Future Technology Devices International (FTDI Chip) 功能描述:COMMUNICATION DEVICES PROVIDE A SIMPLE METHOD OF ADAPTING LEGACY SERIAL DEVICES WITH RS485 INTERFACES TO MODERN USB PORTS 制造商:Future Technology Devices International (FTDI Chip) 功能描述:MODULE DEV USB-RS485 1 COM PORT 制造商:Future Technology Devices International (FTDI Chip) 功能描述:MOD, USB FS TO RS485, 1 PORT, FT232R 制造商:Future Technology Devices International (FTDI Chip) 功能描述:MODULE, USB FS TO RS485 CONV, 1 COM PORT, FT232R; ;ROHS COMPLIANT: YES |
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