【经验】沁恒网络串口透传芯片CH9121常见问题汇总及解答

时间： 2022-05-17 来源：沁恒

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用户在使用沁恒 CH9121 网络串口透传芯片时，容易出现以下问题，本文章将给出解决方案：

一、配置软件搜索不到设备

检查网线连接是否正常，网口的连接指示灯是否亮着，若不亮，则换一根网线或是检查下电脑端网口有没有问题。
将9121恢复出厂设置后再试，具体做法：将9121的RESET脚接地，然后上电维持3s。
配置软件使用了电脑端口50000，检查电脑50000端口是否被占用。（目前已知爱奇艺客户端会占用该端口）
如果9121配置成静态IP接路由器或交换机，则检查下局域网内是否存在ip地址冲突。

二、9121配置成TCP Client/Server，无法和电脑建立TCP连接

连接之前先将电脑的网络防火墙关闭。

先ping一下9121，若ping不通，则先检查网口的指示灯是否亮着，若不亮则换一根网线再试；若网口灯亮，则可能9121模块配置失败，恢复出厂设置后，再重配一次。
TCP CLIENT模式下，若能ping通可能电脑的端口被占用，而有的网络调试软件不会提示，换一下电脑端的tcp端口再试一下。
对于多网卡的电脑，在设置电脑端网络调试软件时要注意选择正确的网卡，最好是打开软件前，将其他网卡都禁用。

三、9121透传无法接收数据

检查串口波特率设置，是否与实际发送的波特率相同。
可以将串口的TX与RX短接，测试自发自收是否正常。

四、9121外围电路设计

9121的PHY是电压型，网络变压器的中心抽头要接3.3V。
RSTI引脚是外部复位脚，低电平有效，可以接电容到地；RESET脚是恢复出厂设置，9121上电检测3S内恒为低电平有效，可以接单片机IO来控制，两个脚不要混淆。
9121电源引脚的退耦电容不可少，而且要靠芯片周围摆放。
设计电源的时候，如果电源转换压差比较大，建议使用DC-DC的电源方案，不建议使用LDO。

五、9121透传模块供电

模块供电可以选择5V或3.3V，通过模块板上靠近网口的J1口跳针来选择，J1口短接，则模块3.3v供电，否则模块5v供电

六、9121连接外网服务器的注意事项和问题处理

9121在连接外网服务器时，由于外网网络环境不好，建议用户在实际使用过程中自行添加心跳包，服务器响应应答心跳包，实时监测9121与服务器之间的网络情况。
心跳包检测不通过时，建议客户复位9121，重新发起连接通讯。

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沁恒（WCH）通讯接口芯片和全栈MCU选型指南

目录- 企业简介接口转换产品 MCU产品选型 USB转串口产品选型低功耗蓝牙系列单片机系列网络系列 USB系列 USB PD协议系列 PCI/PCIE 系列显示驱动及键盘扫描系列单片机外围系列产品方案

型号- CH32V103C6T6,CH32F205RBT6,CH343G,CH32F203C8T6,CH343K,CH573F,CH378,CH440G,CH571K,CH32V208WBU6,CH583M,CH32V208RBT6,CH341T,CH32F103C6T6,CH32V305RBT6,CH342F,CH384,CH342K,CH32F103C8U6,CH340K,CH582M,CH340N,CH340T,CH32V208GBU6,CH341B,CH341A,CH571F,CH341F,CH32V203C8T6,CH486F,CH571D,CH368,CH484M,CH32V307,CH582F,CH340E,CH482,CH32F203C8U6,CH32V305,CH481,CH32V203C8U6,CH340C,CH484,CH32V303,CH483,CH486,CH340G,CH246,CH578,CH457,CH32V303VCT6,CH577,CH335,CH456,CH552T,CH579,CH552P,CH577F,CH32F203C6T6,CH9344,CH451,CH450,CH444G,CH453,CH452,CH334,CH455,CH454,CH9328,CH348,CH9329,CH224P,CH9326,CH34B,CH9342G,CH32F208RBT6,CH581,CH583,CH341,CH462,CH32F203VCT6,CH32F208WBU6,CH582,CH340,CH552E,CH343,CH342,CH463,CH552G,CH345,CH224,CH443K,CH344,CH556,CH555,CH558,CH557,CH559,CH317,CH438,CH224D,CH32V203C6T6,CH442E,CH552,CH551,CH554,CH224K,CH551G,CH343P,CH567,CH446,CH445,CH569,CH448,CH568,CH440R,CH449,CH440P,CH573X,CH9340K,CH9340C,CH32F207VCT6,CH440,CH442,CH344L,CH565,CH444,CH443,CH32V303RCT6,CH32V103R8T6,CH448F,CH9103M,CH9143,CH557Q,CH9140,CH532,CH9142,CH545L,CH531,CH9141,CH545,CH544,CH423,CH547,CH546,CH549,CH548,CH32F103R8T6,CH32F203RCT6,CH541,CH540,CH543,CH422,CH542,CH554T,CH445P,CH554P,CH32V303RBT6,CH9101U,CH579F,CH9101H,CH32V307RCT6,CH32V203K8T6,CH555L,CH9121,CH9120,CH579M,CH522,CH9102X,CH525,CH444P,CH524,CH527,CH528,CH578F,CH554E,CH9344L,CH578M,CH348L,CH554G,CH348Q,CH521,CH9102F,CH9350,CH483M,CH32F203CBT6,CH32V103C8T6,CH483X,CH549L,CH549F,CH549G,CH581F,CH32F103C8T6,CH32F207,CH32F205,CH559T,CH32F203,CH32V103C8U8,CH482X,CH32F208,CH548G,CH32V208,CH548L,CH32V203,CH548N,CH32V208CBU6,CH558T,CH32V303CBT6,CH547G,CH392,CH547F,CH482D,CH395,CH559L,CH547L,CH397,CH32F103,CH546G,CH32V103,CH558L,CH546L,CH481D

2022/01 - 沁恒 - 选型指南代理服务技术支持批量订货

沁恒以太网选型表

沁恒网络以太网系列产品选型表，覆盖PHY芯片、网络透传芯片、TCP/IP协议栈芯片、10/100M以太网控制芯片、USB转以太网、串口转以太网芯片；集成TCP/IP协议栈，可轻松实现网络与其他接口间的数据双向传输，降低串口设备联网难度，广泛应用于工业控制如伺服、变频器等，通信ICT领域、消费电子如摄像仪、监控等。

电源电压（VDD 接电源正极，GND 接地）

LQFP 封装；64 脚；本体 10x10mm

MDI/MDIX极性自动转换，扩展8路GPIO，命令化控制，快速连接以太网。

选型表 - 沁恒立即选型

CH9121 域名串口配置方式

型号- CH9121

2021/2/24 - 沁恒 - 技术文档代理服务技术支持批量订货

【应用】网络串口透传芯片CH9121用在机箱数字电源中实现以太网通信控制，集成10M/100M以太网口

采用网络串口透传芯片CH9121是机箱数字电源实现以太网通信控制的非常合适的选择。此外，CH9121采用尺寸为10x10mm的LQFP64M小尺寸封装，外加内置变压器的RJ45连接器，能够大幅度减少对PCB面积的占用。厂家在技术、供应、价格支持方面均有不错表现。

2023-06-30 - 应用方案代理服务技术支持批量订货

CH334U IC RoHS (SGS) Test Report (CANEC2304439901)

型号- CH32V103C6T6,CH32F103VCT6,CH32F205RBT6,CH32V103VBT6,CH370,CH251,CH372,CH132,CH374,CH252,CH376,CH375,CH378,CH32V107RCT6,CH32V208WBU6,CH32V403CBT6,CH32V003J4M6,CH32F103C6T6,CH382,CH384,CH32V305WBU6,CH237,CH358,CH32F107RCT6,CH236,CH357,CH32F103C8U6,CH238,CH359,CH32L103J4M6,CH32V103VCT6,CH590,CH350,CH471,CH592,CH591,CH231,CH352,CH351,CH472,CH593,CH233,CH354,CH232,CH353,CH235,CH356,CH234,CH355,CH248,CH247,CH368,CH249,CH32V107RBT6,CH32V203G6U6,CH482,CH360,CH481,CH242,CH484,CH241,CH483,CH244,CH365,CH486,CH122,CH243,CH364,CH246,CH367,CH245,CH366,CH457,CH578,CH3232,CH335,CH456,CH577,CH32V303VCT6,CH217,CH338,CH459,CH337,CH458,CH579,CH334U,CH339,CH32V003A4M6,CH32V405RBT6,CH570,CH330,CH451,CH572,CH450,CH571,CH332,CH453,CH574,CH331,CH452,CH573,CH213,CH334,CH455,CH576,CH454,CH575,CH226,CH347,CH225,CH228,CH227,CH348,CH32V403G6U6,CH32V407VCT6,CH32L103G6U6,CH581,CH341,CH462,CH583,CH340,CH582,CH32F208WBU6,CH343,CH464,CH221,CH342,CH463,CH224,CH345,CH344,CH465,CH314,CH556,CH313,CH555,CH316,CH558,CH315,CH557,CH318,CH317,CH438,CH559,CH319,CH32L103F4U6,CH32F103VBT6,CH552,CH32L103FBP6,CH551,CH312,CH554,CH311,CH432,CH553,CH446,CH567,CH445,CH448,CH569,CH447,CH568,CH449,CH32F207VCT6,CH440,CH561,CH321,CH442,CH563,CH441,CH562,CH323,CH444,CH565,CH322,CH443,CH564,CH413,CH534,CH412,CH533,CH536,CH538,CH537,CH539,CH32V103R8T6,CH9936,CH9937,CH32V203F8U6,CH32V403C6T6,CH530,CH32V203G8R6,CH411,CH532,CH410,CH531,CH424,CH545,CH423,CH544,CH547,CH546,CH549,CH548,CH32F103R8T6,CH32V403F8P6,CH32V407RCT6,CH541,CH32L103CBT6,CH540,CH422,CH543,CH421,CH542,CH633,CH632,CH635,CH32V003F4P6,CH634,CH516,CH637,CH636,CH639,CH638,CH32L103F4P6,CH32V307RCT6,CH32L103CBU6,CH631,CH32V203G8P6,CH523,CH522,CH643,CH525,CH524,CH527,CH526,CH529,CH528,CH32V203F6P6,CH521,CH642,CH520,CH641,CH32F107RBT6,CH32F203CBT6,CH32V105RBT6,CH32V103R6T6,CH32V403G8P6,CH622,CH621,CH32V003F4U6,CH32F103R6T6,CH32F105RCT6,CH32V403F6P6,CH32L103G8P6,CH32V105RCT6,CH32V403F8U6,CH32V403G8R6,CH32V303CBT6,DM7407,CH32L103F8U6,CH32V305FBP6,CH32L103F6P6,CH32V405FBP6,CH32L103G8R6,CH32V403K6T6,CH9415,CH9413,CH9414,CH9412,CH32F107VBT6,CH8572,CH8571,CH32F203C8T6,CH8570,CH9884,CH32V208RBT6,CH32L103C6T6,CH32V305RBT6,CH9516,CH9514,CH9515,CH9512,CH9513,CH9511,CH32V208GBU6,CH32L103F8P6,CH9882,CH32V203C8T6,CH9626,CH9627,CH9624,CH9625,CH9622,CH9623,CH32F105RBT6,CH9628,CH9629,CH32F203C8U6,CH32V203C8U6,CH9578,CH9576,CH9577,CH32V405WBU6,CH32V403C8T6,CH32F103RCT6,CH32V103RBT6,CH9100,CH9342,CH32F203C6T6,CH9341,CH9102,CH9344,CH9101,CH9343,CH9463,CH9340,CH9328,CH9327,CH9569,CH9329,CH9326,CH9565,CH9325,CH9445,CH9566,CH32V107VCT6,CH32L103C8T6,CH32V403C8U6,CH32F208RBT6,CH9331,CH9574,CH9330,CH9575,CH9573,CH32F203VCT6,CH9317,CH9318,CH9438,CH9435,CH9436,CH9315,CH9433,CH9434,CH32F107VCT6,CH32L103C8U6,CH32V103RCT6,CH9320,CH32V203C6T6,CH32V307VCT6,CH9426,CH32V107VBT6,CH32V403VCT6,CH9431,CH9552,CH9432,CH32V203F8P6,CH32V303RCT6,CH32L103K6T6,CH32F203K8T6,CH9144,CH32L103A4M6,CH9143,CH9145,CH9140,CH9142,CH9141,CH9126,CH32V407WCU6,CH32F105VCT6,CH32F203RCT6,CH9375,CH9374,CH9371,CH9370,CH9373,CH9130,CH9372,CH32V303RBT6,CH32F103RBT6,CH32V203K8T6,CH9122,CH9121,CH9120,CH32V307WCU6,CH9104,CH9346,CH9103,CH9345,CH32V403RCT6,CH32F203RBT6,CH9232,CH9110,CH9234,CH9230,CH9350,CH32V203RBT6,CH32V103C8T6,CH32V403K8T6,CH32L103K8T6,CH32F103C8T6,CH32V403RBT6,CH32V103C8U6,CH32V105VCT6,CH181,CH183,CH182,CH32V208CBU6,CH390,CH392,CH32V203K6T6,CH394,CH9165,CH396,CH395,CH32L103GBU6,CH398,CH397,CH9161,CH32F105VBT6,CH32V105VBT6,CH9397,CH9150,CH9153,CH9152

31 Mar 2023 - 沁恒 - 测试报告代理服务技术支持批量订货