Differences

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--- comfilepi:cpi-s_io:index [2026/06/17 08:01] – mfranklin
+++ comfilepi:cpi-s_io:index [2026/06/17 08:02] (current) – mfranklin
@@ Line 11: / Line 11: @@
 The panel PC's RTC is connected to I2C1, so those pins assigned to I2C1 should not be reconfigured.
+===== Underside IO =====
+The underside of the CPi-S panel PCs expose 12~24VDC power input, 1 RS-232 serial port, 1 RS-485 serial port, 3 USB 2.0 ports, an I2C port, 5V power output, and an RJ45 Ethernet port.
+{{ :comfilepi:comfilepibackcon.png |}}
+Please note that the I2C pins (SDA and SCL) are 3.3V; the 5V pin is supplied to ensure users have enough voltage and current to power their external devices and does not imply a 5V I2C port.
+The USB device port dedicated to [[https://www.comfilewiki.co.kr/en/doku.php?id=comfilepi:raspbian:index#installation_instructions|programming the Compute Module's eMMC]].
+==== Side Panel IO ====
+The right panel of the CPi-S panel PCs exposes a MicroSD card slot and a stereo audio output jack.
+{{ :comfilepi:pinout4.png?300 |}}
+For models with an eMMC, the MicroSD card slot is not electrically connected, so it cannot be used.