# 125kHz Transponder Unit 5E9000.29 in AS 4.11

**URL:** <https://community.br-automation.com/t/125khz-transponder-unit-5e9000-29-in-as-4-11/1516>\
**Category:** HMI & Visualization\
**Tags:** automation-studio, plc\
**Created:** [December 12, 2023, 12:51pm UTC](https://community.br-automation.com/t/125khz-transponder-unit-5e9000-29-in-as-4-11/1516 "2023-12-12T12:51:54Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![alin.oltean](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/alin.oltean/32/430_2.png) [@alin.oltean](https://community.br-automation.com/u/alin.oltean)\
**Post date:** [December 12, 2023, 12:51pm UTC](https://community.br-automation.com/t/125khz-transponder-unit-5e9000-29-in-as-4-11/1516/1 "2023-12-12T12:51:54Z")

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Hey everyone,  
Did anyone integrate lately the 125 kHz transponder reader into a PLC?  
I’m trying to read data from B&R 125 kHz transponder keys and some 3rd party access cards.  
I’ve looked over the provided documentation (and example C program) but I can’t seem to get it working.  
I’ve also tried modifying my existing and working code for 13 MHz transponder reader but to no avail.  
What I’m doing:

- using AsUSB getting the address to connect it ✅
- using DvFrame deviceopen, with the indicated mode: ‘/FLAGS=2 /MODE=0’ , as seen in the datasheet ✅
- init reader with FRMwrite ‘tag,0,0,#crc\r\n’ - like in the C example ✅
- try to read tag with the same FRMwrite as seen in the C example ✅
- not getting any reply from the transponderreader , error 60 on FRMread ❌

Other notes:  
The C example provided in the PDF datasheet seems out of date. The dvframe library does not have the datatypes declared there.  
I’m using a CP0483 to connect the unit via USB, same as the 13 MHz unit which is working.  
Connecting the unit to windows 11, in the device manager I get the message that PL2303TA DO NOT SUPPORT WINDOWS 11 OR LATER, PLEASE CONTACT YOUR SUPPLIER.

Anyone can help here ? Maybe with a sample more recently implemented communicating with this Transponder Unit ?

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**Author:** ![jan.van-de-wielle](https://avatars.discourse-cdn.com/v4/letter/j/FF8800/32.png) [@jan.van-de-wielle](https://community.br-automation.com/u/jan.van-de-wielle)\
**Post date:** [December 12, 2023, 3:11pm UTC](https://community.br-automation.com/t/125khz-transponder-unit-5e9000-29-in-as-4-11/1516/2 "2023-12-12T15:11:02Z")

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Did you check out the example that can be imported in Automation Studio (via Toolbox - Samples - Library Samples - Library - AsUSB)?  
I’ve tested the 2nd example quickly (the ST code, LibAsUSB2\_ST) on a X20CP0484-1 and this works out of the box. The tag I am using is a 5A9000.42.  
 ![2023-12-12_16-07-56](https://europe1.discourse-cdn.com/brcommunity/original/1X/ca07346250de3da5ec1a6feeeacc6a9619ad2c80.gif)

As you can see I also occasionally some statusses 60 although a tag was present but nevertheless, the tag gets read properly. Hope this can help!

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**Author:** ![alin.oltean](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/alin.oltean/32/430_2.png) [@alin.oltean](https://community.br-automation.com/u/alin.oltean)\
**Post date:** [December 13, 2023, 6:31am UTC](https://community.br-automation.com/t/125khz-transponder-unit-5e9000-29-in-as-4-11/1516/3 "2023-12-13T06:31:37Z")

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Hi Jan,  
It seems I forgot to search all places and rushed to the Community 😀  
Thank you very much for your answer, indeed the example LibAsUSB2\_ST from AsUSB works out of the box also for me.  
Much appreciated!