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422TTL modification for Bench DC Power

Introduction

The Advantech 422TTL is used to convert a TTL signal, into a differential 422 signal. However, when using the recommended power supply, the output on the RS-422 side is absolute garbage due to the cheap switching power supply injecting noise. We were converting PPS.

We fixed this by using a bench top 12VDC power supply for nice clean power. This guide will document that modification.

  1. 422TTL modification for Bench DC Power, Disassemble Unit: step 1, image 1 of 3 422TTL modification for Bench DC Power, Disassemble Unit: step 1, image 2 of 3 422TTL modification for Bench DC Power, Disassemble Unit: step 1, image 3 of 3

    • Remove side sticker (DC Power 12VDC)

    • Remove hardware (Screws and metal tabs)

    • Carefully lift 4 tabs (2 per side) to split unit into two halves.

    Edit

  3. 422TTL modification for Bench DC Power, Remove PCB and Remove/desolder power jack: step 2, image 1 of 3 422TTL modification for Bench DC Power, Remove PCB and Remove/desolder power jack: step 2, image 2 of 3 422TTL modification for Bench DC Power, Remove PCB and Remove/desolder power jack: step 2, image 3 of 3

    • Remove the PCB from housing, examining where the headphone style power adapter attaches.

    • Desolder and remove the power adapter.

    Edit

  4. 422TTL modification for Bench DC Power, Solder new power lines to the PCB.: step 3, image 1 of 3 422TTL modification for Bench DC Power, Solder new power lines to the PCB.: step 3, image 2 of 3 422TTL modification for Bench DC Power, Solder new power lines to the PCB.: step 3, image 3 of 3

    • Positive (red) and negative (black) power lines should attach where the socket was removed.

    Edit
Conclusion

To reassemble your device, follow these instructions in reverse order.

Author

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warrenjrose

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