UART Communication Board | YPK113A 5761857-4A | ABB

Technical Specifications

The ABB YPK113A 5761857-4A provides two communication interfaces on the board. Connector X2 is a 9-pin D-Sub RS232 interface for standard serial communication, while connector X3 is a 20 mA current loop terminal interface used in industrial communication networks. The communication speed is selectable up to 19,200 bit/s, allowing reliable serial data transmission for industrial applications that require standardized UART communication.

Troubleshooting & Commissioning Checklist

Verify Jumper Matrix AlignmentOlder ABB boards rely heavily on onboard hardware jumpers to define baud rates, protocol choices, and termination resistors. Mirror the jumper positions from the old board exactly to the replacement card.
Clean the Backplane Edge ConnectorUse an electrical contact cleaner to wipe the gold fingers on the card. Dust or oxidation here will cause intermittent backplane power losses or data drops.
Grounding and Shielding VerificationCheck that the communication cable shields are properly grounded at one end to the cabinet PE bar. Poor grounding introduces EMI from high-power variable frequency drives.

Field Engineering Considerations

Zero Hot-Swapping: The YPK113A 5761857-4A does not support hot-swapping. Inserting or removing the card while the rack or APC controller is energized can cause an electrical arc across the backplane pins, permanently destroying the card's logic gates or crashing the entire control rack.
Lockout/Tagout: Always isolate the 24V DC backplane power source and any auxiliary AC communication voltages (110V/220V) feeding the isolation loops before servicing.
Component Vulnerability: Legacy CMOS and UART chips on the YPK113A 5761857-4A have low threshold tolerances for static electricity compared to modern ruggedized cards.
Field Handling: Field engineers must use a grounded ESD wrist strap connected to the cabinet frame before removing the card from its anti-static bag or touching the PCB components.

Technical FAQ

Q: Can I hot-swap the YPK113A 5761857-4A board while the system is powered up?
A: No. This legacy card lacks hot-swap protection circuitry. Inserting or pulling it under power can cause severe electrical arcing across backplane pins, permanently destroying the card or causing a master system crash. Always shut down power before servicing.

Q: The yellow TX/RX LEDs on my YPK113A 5761857-4A are completely dark. Does this mean the board is dead?
A: Not necessarily. Dark LEDs mean there is no active polling or data traffic passing through the UART chip. This can be caused by a faulty external cable, an incorrect software node address configuration, or a halted program in the master controller.

Q: How do I configure the baud rate and node address on a new YPK113A 5761857-4A replacement board?
A: These parameters are configured via physical onboard hardware jumpers. You must manually match the exact jumper patterns and switch matrix layout from your original board onto the new replacement unit before installation.

Q: My YPK113A 5761857-4A experiences intermittent communication timeouts. What is the most common cause?
A: Electromagnetic Interference from adjacent high-power variable frequency drives is the leading cause. Ensure that communication cable shields are properly grounded at a single point and that signal cables do not run parallel to high-voltage motor wires.

Q: Do you supply brand-new, original parts or second-hand refurbished items?

A: Our stock consists of Original New items; all products undergo quality inspection to ensure they are fully functional.

Q: What guarantees are included with the shipment?
A: All items in stock are tested by engineers, packed in professional ESD packaging, and shipped via express logistics with a global delivery time of 24–48 hours.

Q: How long does global shipping take?
A: Stock items are typically dispatched within 24 hours. Shipments are sent via DHL or FedEx Express, taking approximately 3–5 days to reach Asia, 4–6 days to Europe and the Middle East, and usually arriving within a week in major industrial regions worldwide.

Q: If the model I need is not listed on the website, can I request a quote?
A: Yes. We hold over 200,000 SKUs of industrial spare parts in stock, and many long-tail models are not listed in full. You can send us an RFQ (Request for Quote) directly, and we will provide wholesale pricing promptly.

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