> ## Documentation Index
> Fetch the complete documentation index at: https://nayax-44d6e37b-docs-marshall-faq-redistribution.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Marshall Hardware Specifications

> Power, serial interface, and supported card specifications for Marshall devices

The specifications below cover what the device needs from your machine
electrically and which cards its reader accepts.

## Power Requirements

Marshall devices need a 24V power source rated at a minimum of 1.5A.

12V is not enough. At that voltage the device struggles to tell a `0` from a
`1`, which corrupts packets in both directions, triggers retries, and produces
CRC errors. Power-up draws a spike of current, so a 12V supply can also crash
the device partway through boot. A Chipi-X adapter draws power of its own,
which makes 12V even less likely to hold up.

## Serial Interface

The Marshall line is true RS232 with a level shifter, not UART signals at 5V or
3.3V.

The RS-232 standard specifies −15V to −3V and +3V to +15V. The components Nayax
uses operate at roughly ±7V.

No hardware handshaking is needed. The interface uses only RxD, TxD, and GnD,
so RTS and CTS can be left unconnected.

## Power Consumption

The figures below are typical for VPOS Media.

| State | Consumption |
| :---- | :---------- |
| Idle  | 3W to 4W    |
| Peak  | 5W to 7W    |

## Supported Cards

Which of the technologies below applies to you depends on the cards your
deployment issues.

Nayax readers accept both swipe (magstripe) and RFID cards.

The reader works at 13.56 MHz and supports ISO 14443 Type A and Type B cards,
such as MiFare Classic and MiFare Plus, as well as ISO 15693 cards, such as HID
iClass. The most common RFID card used with Nayax readers is MiFare Classic 1K
or 4K.

Magstripe cards are supported when they follow a non credit card standard, which
means the card data contains no `=` character and the UID length is between 4
and 40. Cards that fall outside those limits can still be supported, but doing
so may require an additional integration through
[Cortina Prepaid](/docs/cortina/prepaid-card/prepaid-card-flows).

## See Also

* [Marshall Integration Kit](/docs/integrate-pos-device/marshall/hw-integration-kit-and-setup/sales-kit)
* [Installation Steps](/docs/integrate-pos-device/marshall/hw-integration-kit-and-setup/installation-steps)
* [Marshall Troubleshooting](/docs/integrate-pos-device/marshall/additional-resources/troubleshooting)