# pinout

* [RS232](#rs232)
* [RS485](#rs485)
* [USB3](#usb3)
  * [Type-C](#type-c)
* [PCI-E](#pci-e)
* [HMDI](#hmdi)
  * [19 Pins](#19-pins)
* [Channel](#channel)
* [DVI/HMDI](#dvihmdi)

## I2C

<https://en.wikipedia.org/wiki/I%C2%B2C>

* differential driver: 20-100m

  VCC - 3V–5V GND - GND SDA - Data SCL - Clock

## RS232

[RS232簡單接法(3線)](http://flykof.pixnet.net/blog/post/24074586-rs232%E7%B0%A1%E5%96%AE%E6%8E%A5%E6%B3%95\(3%E7%B7%9A\))\
![](https://pic.pimg.tw/flykof/4a729ba808337.jpg)

## RS485

Line Termination Resistor Calculator: <http://www.alciro.org/tools/RS-485/RS485-resistor-termination-calculator.jsp>

## USB3

VBUS/GND: shared by USB2/3; D-/D+: USB2 only.

![](https://imgur.com/Z8covNr.png)\
<https://en.wikipedia.org/wiki/USB\\_3.0>

![](https://upload.wikimedia.org/wikipedia/commons/8/82/USB_2.0_and_3.0_connectors.svg)

### Type-C

* Receptacles: 12+12 Pins
* Plugs: 12+10 Pins: B6/7 n/a & CC2 -> VCONN

| Pin    | Name            | Description                                         |
| ------ | --------------- | --------------------------------------------------- |
| A1/B12 | GND             | Ground return                                       |
| A2     | SSTXp1 ("TX1+") | SuperSpeed differential pair #1, transmit, positive |
| A3     | SSTXn1 ("TX1−") | SuperSpeed differential pair #1, transmit, negative |
| A4     | VBUS            | Bus power                                           |
| A5     | CC1             | Configuration channel                               |
| A6     | D+              | USB 2.0 differential pair, position 1, positive     |
| A7     | D−              | USB 2.0 differential pair, position 1, negative     |
| A8     | SBU1            | Sideband use (SBU)                                  |
| A9     | VBUS            | Bus power                                           |
| A10    | SSRXn2 ("RX2−") | SuperSpeed differential pair #4, receive, negative  |
| A11    | SSRXp2 ("RX2+") | SuperSpeed differential pair #4, receive, positive  |
| A12    | GND             | Ground return                                       |

## PCI-E

<https://en.wikipedia.org/wiki/PCI\\_Express#Pinout>

```
side A: PRSNT1# shorter than the rest | side B: component side
×1/4/8/16 cards end at pin 18/32/49/82  
+12 V power: 75 W (6-pin) or 150 W (8-pin) | 300 W total (2 × 75 W + 1 × 150 W)
```

![](https://imgur.com/u3rUvyL)

## HDMI

<https://en.wikipedia.org/wiki/HDMI>

| Type | Name       | -       |
| ---- | ---------- | ------- |
| A    | Std        |         |
| C    | Mini       |         |
| D    | Micro      |         |
| E    | Automotive | locking |

### 19 Pins

```
Pin 17	Ground for ARC, CEC, DDC and HEC
Pin 18	+5 V (up to 50 mA)

Pin 1	TMDS data 2 (+)
Pin 2	TMDS data 2 ground
Pin 3	TMDS data 2 (−)

Pin 4	TMDS data 1 (+)
Pin 5	TMDS data 1 ground
Pin 6	TMDS data 1 (−)

Pin 7	TMDS data 0 (+)
Pin 8	TMDS data 0 ground
Pin 9	TMDS data 0 (−)

Pin 10	TMDS clock (+)
Pin 11	TMDS clock ground
Pin 12	TMDS clock (−)

Pin 15	SCL (I2C clock for DDC)
Pin 16	SDA (I2C data for DDC)

Pin 13	CEC / Consumer Electronic Control

Pin 14
        HDMI 1.0–1.3a: Unused
        HDMI 1.4+: ARC (+) or HEC (+)
Pin 19
        All versions: Hot plug detect
        HDMI 1.4+: ARC (−) or HEC (−)
```

## Channel

* Audio Return Channel (ARC): supports stereo PCM
* HDMI Ethernet Channel (HEC): IP-based @ 100 Mbit/s

## DVI/HMDI

DVI: <http://www.alciro.org/alciro/conectores\\_26/conector-DVI-interfaz-visual-digital\\_269\\_en.htm>

```
C1	Red analog	
C2	Green analog	
C3	Blue analog	
C4	Analog horizontal sync	
C5	Ground (analog)	Return for analog signals
```

HDMI to DVI-D: <http://www.alciro.org/alciro/conectores\\_26/patillas-cable-HDMI-a-DVI-D\\_274\\_en.htm>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://book.ferro.pro/hw/pinout.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.