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MaxLinear XR21B1420IL28-0A-EVB USB to RS-232/422/485 Evaluation Board (view source)
Revision as of 23:45, 15 January 2023
, 23:45, 15 January 2023added jumper information
* [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
== Jumpers ==
{| class="wikitable"
! Name
! Default
! Function
|-
| J2
| 1 & 2 (down)
| 1 & 2 (down): VCC_OUT to VCC_TRANS<br/>2 & 3 (up): VCC_USB to VCC_TRANS
|-
| J3
|
| pins map to DE9 connector, except pin 5 (GND) is skipped
|-
| J4
|
| 47k pull-ups to VCC_TRANS for jumpering to J18
|-
| J10
| 1 & 2 (right)
| 1 & 2 (right): VCC_USB to VCC_UART<br/>2 & 3 (left): VCC_3V3 to VCC_UART
|-
| J11
| (not present)
| 1 & 2 (left): VCC_OUT to VIO<br/>2 & 3 (right): VIO_EXTERNAL to VIO
|-
| J12
| 1 & 2 (down)
| 1 & 2 (down): GPIO0/!RI/!RWK to SW1 button<br/> 2 & 3 (up): GPIO0/!RI/!RWK to !RI_TRANS
|-
| J13
| 2 & 3 (left)
| 1 & 2 (right): VIO to VCC<br/>2 & 3 (left): VCC_OUT to VCC
|-
| J15
| 2 & 3 (up)
| 1 & 2 (down):<br/>2 & 3 (up)
|-
| J17
| 2 & 3 (up)
| 1 & 2 (down): TXT_MODE1 to TXT<br/>2 & 3 (up): pullup/D1 LED to TXT
|-
| J18
| ???
| TODO
|-
| J19
| (not present)
| 1 & 2: connects the regulated 3.3V from the SP6260 to the VCC pin of the XR21B1420
|-
| J20
| 1 & 2
| 1 & 2: GPIO9/!DSR to !DSR (transceiver) NOTE: manual claims GPIO2? schematic says GPIO9...
|-
| J21
|
| 1 & 2 (down): XEN to J37 pin 3 <br/>2 & 3 (up): !RTS_XEN to J37 pin 3
|-
| J23
|
| ...<br/>3 & 4: VCC_USB to !RESET</br>...
|-
| J24
|
| (various debug signals)
|-
| J37
|
| ...<br/>3 & 4 (2nd from left): XEN or !RTS_XEN to DIR1</br>...
|}
== Software ==
== Software ==