Difference between revisions of "MaxLinear XR21B1420IL28-0A-EVB USB to RS-232/422/485 Evaluation Board"
(added Linux driver instructions) |
(added pinout table) |
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== Wiring Diagram == | == Wiring Diagram == | ||
| + | |||
| + | {| class="wikitable" | ||
| + | ! DB9 Pin | ||
| + | ! RS-232 | ||
| + | ! RS-422 | ||
| + | ! RS-485 | ||
| + | |- | ||
| + | | 1 | ||
| + | | DCD | ||
| + | | TX- | ||
| + | | Data- | ||
| + | |- | ||
| + | | 2 | ||
| + | | RXD | ||
| + | | TX+ | ||
| + | | Data+ | ||
| + | |- | ||
| + | | 3 | ||
| + | | TXD | ||
| + | | RX+ | ||
| + | | | ||
| + | |- | ||
| + | | 4 | ||
| + | | DTR | ||
| + | | RX- | ||
| + | | | ||
| + | |- | ||
| + | | 5 | ||
| + | | colspan="3" | (GND) | ||
| + | |- | ||
| + | | 6 | ||
| + | | DSR | ||
| + | | | ||
| + | | | ||
| + | |- | ||
| + | | 7 | ||
| + | | RTS | ||
| + | | | ||
| + | | | ||
| + | |- | ||
| + | | 8 | ||
| + | | CTS | ||
| + | | | ||
| + | | | ||
| + | |- | ||
| + | | 9 | ||
| + | | RI | ||
| + | | | ||
| + | | | ||
| + | |} | ||
* [https://www.maxlinear.com/ds/sp339e.pdf#page=5 Page 5] of the SP339E datasheet shows the DE9 pinout | * [https://www.maxlinear.com/ds/sp339e.pdf#page=5 Page 5] of the SP339E datasheet shows the DE9 pinout | ||
Revision as of 11:51, 31 August 2020
Overview
USB to serial evaluation board. Supports RS-232, RS-422, and RS-485. Made by MaxLinear, formerly Exar. Supposedly supports higher than usual baudrates, up to 12Mbaud.
MaxLinear XR21B1420IL28-0A-EVB | DigiKey
MaxLinear XR21B1420IL28-0A-EVB | Mouser
Wiring Diagram
| DB9 Pin | RS-232 | RS-422 | RS-485 |
|---|---|---|---|
| 1 | DCD | TX- | Data- |
| 2 | RXD | TX+ | Data+ |
| 3 | TXD | RX+ | |
| 4 | DTR | RX- | |
| 5 | (GND) | ||
| 6 | DSR | ||
| 7 | RTS | ||
| 8 | CTS | ||
| 9 | RI | ||
- Page 5 of the SP339E datasheet shows the DE9 pinout
Software
To get full functionality under Linux, you must install the xr_usb_serial_common kernel module. The drivers are available here:
In the "USB UART" section in their downloads table, pick the latest version for Linux. Here is a direct link to version 1C for "Linux 3.6.x and newer":
xr_usb_serial_common_lnx-3.6-and-newer-pak.zip
If successfully installed, when the USB device (04e2:1420 Exar Corp.) is connected it the device node /dev/ttyXRUSB0 should show up.
Bill of Materials
| Name | Part |
|---|---|
| U2 | MaxLinear SP339ECR1-L |
| U3 | MaxLinear XR21B1420IL28-F |
Online Resources
Exar XR21B1420IL28-0A-EVB Evaluation Board User’s Manual Rev 1A
Exar XR21B1420/21 Evaluation Board Schematic Rev 1.0
Exar XR21B1420IL28-0A-EVB Evaluation Board User’s Manual Rev 1A
Exar XR21B1420/21 Evaluation Board Schematic Rev 1.0