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If J21 is selected, MPUART1 is not available and the connector's pinout is the one detailed in the following table.
{|class="wikitable" style="text-align: center;"
|+CAN interface on J40J21
|-
!Pin #
!Notes
|-
| 1||Shieldnot connected||CAN_SHIELDn/a||
|-
| 2||not connectedDominant low||n/aCAN_M||
|-
| 3||Ground||CAN_GND||
|-
| 4||Dominant lownot connected||CAN_Mn/a||
|-
| 5||not connectedShield||n/aCAN_SHIELD||
|-
| 6||not connected||n/a||
|-
| 7||not connectedDominant high||n/aCAN_P||
|-
| 8||Dominant highnot connected||CAN_Pn/a||
|-
| 9||not connected||n/a||
J40 is a 0.200-inch pitch 3-pin shrouded header (Phoenix 1755749 MSTBVA2.5/3-G5.08). Please refer to the following table for the detailed pinout.
{|class="wikitable" style="text-align: center;"
|+CAN interface on J21J40
|-
!Pin #
