USB connector endUSB连接端
The USB-form end provides a device connection boundary, with end orientation and lead routing arranged for the installation space.USB形式的端头可作为设备接入边界，端头朝向与引线走向按安装空间布置。
FTDI Cable AssemblyFTDI电缆组件
USB to DB9 Serial HarnessUSB转DB9串口线束
USB to DB9 Serial Harness combines usb connector end, d-sub interface end, end transition layout. Interface, circuit and installation data guide dimensions, material selection and sample review.USB转DB9串口线束的结构重点包括USB连接端、D-Sub接口端、端头转接与组合。接口、电路与安装资料将作为尺寸、物料和样品制作的确认依据。
- USB connector endUSB连接端
- D-Sub interface endD-Sub接口端
- End transition layout端头转接与组合
CONSTRUCTION结构解析
Connection structure and design details连接结构与设计要点
Use the usb to db9 serial harness form as a starting point and confirm these design points against drawings and the actual equipment.以USB转DB9串口线束的结构形式为起点，结合图纸和实际设备确认以下设计要点。
D-Sub interface endD-Sub接口端
The D-Sub-form end allows equipment connection to be arranged around the mating face, fixing screws and rear cable route.端头采用D-Sub形式，可围绕插合面、固定螺钉和后部线缆走向安排设备连接。
End transition layout端头转接与组合
The assembly organizes a transition or combined connection, with end directions, transition sections and fixing arranged around the equipment positions.组件以转接或组合形式组织连接，可围绕两端设备位置安排端头方向、过渡段与固定。
Signal path信号路径
Define signal type, pair allocation, shield continuity and termination as well as the connector shape. Establish transmission performance from the actual cable, length and system validation.在接口外形之外确认信号类型、线对分配、屏蔽连续性和端接方法；传输能力应按实际线材、长度及整机验证结果确定。
CONFIGURATION结构与选配
Construction & customization options结构与定制配置
The table describes the construction and available configuration choices. Materials, dimensions, circuits and inspection requirements are agreed for each project.以下说明展示结构与可配置内容。具体材料、尺寸、电路和检验要求按项目确认。
| Full FTDI chip/module model and sourceFTDI芯片或模块完整型号与来源 | Specify the complete FTDI chip or module model and permitted supply sources.指定FTDI芯片或模块的完整型号及允许供货来源。 |
|---|---|
| TTL, RS232 or RS485-side electrical levelsTTL、RS232或RS485侧电平 | Define the TTL, RS232 or RS485 equipment-side interface and levels.明确TTL、RS232或RS485设备侧接口及电平。 |
| USB enumeration, driver and device-identification configurationUSB枚举、驱动与设备识别配置 | Record USB enumeration, driver versions and device-identification settings.记录USB枚举、驱动版本及设备识别配置。 |
| Serial pinout, power and isolation requirements串口针脚、供电与隔离要求 | Define serial pins, power direction and any isolation requirement on the drawing.图纸定义串口针脚、供电方向及是否需要隔离。 |
| Installation and operating boundary安装与使用边界 | Provide the host, target equipment, pin map, serial layer, I/O voltage, signals, driver behavior, protection and validation method.请提供主机、目标设备、针脚表、串行电气层、I/O 电平、信号、驱动行为、防护与验证方法。 |
| Sample and release basis样品与放行依据 | Release records electronics, programmed configuration, cable BOM, endpoints, circuit map, labels and agreed passive and active tests.放行文件记录电子器件、编程配置、线缆 BOM、端点、回路图、标签及约定的被动与有源测试。 |
APPLICATIONS连接的应用
Application directions应用方向
These are connection directions for project discussion. Suitability depends on interfaces, circuits, installation conditions and project validation; configuration can be adapted to the equipment.以下为可讨论的连接方向。实际适用性取决于接口、电路、安装环境和项目验证，可按设备需求调整。
Controller debugging and signal review控制器调试与信号核对
Define serial debug leads from device voltage levels, pin assignments and reference ground. Describe power and data circuits separately in the connection table. Specify the complete FTDI chip or module model and permitted supply sources.串行调试线应从目标设备电平、针脚和参考地出发定义，供电与数据回路需在连接表中分开说明。选配时，指定FTDI芯片或模块的完整型号及允许供货来源。
Equipment control-board connections设备控制板连接
Document pin-row views, mating direction and nearby wire support. Check access to the latch and contacts after assembly. Define the TTL, RS232 or RS485 equipment-side interface and levels.板端连接要给出针排视图、插合方向和近端线缆支撑；检查装配后是否仍能操作锁扣并查看接点。选配时，明确TTL、RS232或RS485设备侧接口及电平。
Instrument inputs and measurement leads仪器输入与测量引线
Start measurement leads from signal type, input conditions and grounding. Select pairs and shields for the actual measurement range and noise target. Record USB enumeration, driver versions and device-identification settings.测量引线以信号类型、输入条件和接地方式为起点，线对与屏蔽选择需要对应实际量程和噪声目标。选配时，记录USB枚举、驱动版本及设备识别配置。
USB host and device portsUSB主机与设备端口
Define host and device roles, interface form and power direction. For active adapters, also record enumeration and driver requirements. Define serial pins, power direction and any isolation requirement on the drawing.USB连接需要明确主机与设备角色、接口形式和供电方向，有源转接还应记录枚举与驱动要求。选配时，图纸定义串口针脚、供电方向及是否需要隔离。
Module wiring within enclosures机箱内部的模块配线
Coordinate board positions, module removal and wire bends within the enclosure. Preserve insulation clearance and support behind each termination. Specify the complete FTDI chip or module model and permitted supply sources.机箱内部配线需要协调板卡位置、模块拆装和导线转弯空间；端接后的绝缘与支撑不能被外壳挤压。选配时，指定FTDI芯片或模块的完整型号及允许供货来源。
External interfaces on portable equipment便携设备的外部接口
Consider handling, plug grip and cable bends together. Align the exit direction with the device position during use. Define the TTL, RS232 or RS485 equipment-side interface and levels.便携设备连接要同时考虑操作手势、插头握持和尾部弯曲空间，线缆出口方向应与实际使用姿态协调。选配时，明确TTL、RS232或RS485设备侧接口及电平。
ENGINEERING & PRODUCTION工程与制造
Adapt the connection to your equipment.围绕设备，调整连接细节。
Touched by me, better it’ll beTouched by me, better it’ll be
Custom wire harness manufacturing in China中国工厂 · 定制线束制造
Our China factory supports ftdi cable assembly projects through custom wire harness manufacturing and OEM/ODM development. Interface, circuit and installation data guide material selection, sample builds and manufacturing-document approval before repeat production.Super Smile-Tech 中国工厂围绕FTDI电缆组件的项目需求提供定制线束制造与 OEM/ODM 支持。我们从接口、电路与安装资料开始，协同物料选配、样品制作和制造文件确认，再按批准要求组织重复生产。
Define termination and protection boundaries确定端接与保护边界
Specify the complete FTDI chip or module model and permitted supply sources. Do not interconnect TTL, RS232 and RS485 directly.指定FTDI芯片或模块的完整型号及允许供货来源。 TTL电平、RS232和RS485不可互接。
Match dimensions and operating motion配合尺寸与使用动作
Define the TTL, RS232 or RS485 equipment-side interface and levels. A source model does not establish original silicon or authorization.明确TTL、RS232或RS485设备侧接口及电平。 来源型号不证明原厂芯片或授权。
Verify processing and finished condition验证工艺与成品状态
Record USB enumeration, driver versions and device-identification settings. Validate drivers and communication on the target system.记录USB枚举、驱动版本及设备识别配置。 目标系统驱动与通信需实机验证。
PRODUCT QUESTIONS产品问答
Product & customization questions产品与定制常见问题
Can TTL, RS232 and RS485 be connected interchangeably?TTL、RS232与RS485可以互接吗？
Do not interconnect TTL, RS232 and RS485 directly. Specify the complete FTDI chip or module model and permitted supply sources.TTL电平、RS232和RS485不可互接。指定FTDI芯片或模块的完整型号及允许供货来源。
Does the interface name establish chip provenance?接口名称能证明芯片来源吗？
A source model does not establish original silicon or authorization. Define the TTL, RS232 or RS485 equipment-side interface and levels.来源型号不证明原厂芯片或授权。明确TTL、RS232或RS485设备侧接口及电平。
Does continuity acceptance ensure successful communication?导通合格是否代表通信一定正常？
Validate drivers and communication on the target system. Record USB enumeration, driver versions and device-identification settings.目标系统驱动与通信需实机验证。记录USB枚举、驱动版本及设备识别配置。
Start with your interface and installation requirements从您的接口与安装需求开始
Share mating interfaces, a circuit table, target lengths or a sample for the usb to db9 serial harness. We can use them to review configuration and sample requirements.提供USB转DB9串口线束的对插接口、回路表、目标长度或参考样品，我们据此梳理选配与样品确认事项。