# USB FTDI Converters Data Sheet

## USB RS232 RS485 Converters (C37 & C38)

<table border="1" id="bkmrk-c37%28ex%29-c38%28ex%29-feat" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 50%;"></col><col style="width: 50%;"></col></colgroup><tbody><tr><td>**C37(EX) C38(EX)**

**[![image.webp](https://doc.redisage.com/uploads/images/gallery/2024-04/scaled-1680-/image.webp)](https://doc.redisage.com/uploads/images/gallery/2024-04/image.webp)**

</td><td>**Features**

- USB to UART or RS232/RS485 converter
- ESD protection for the RS485 data line
- Transmission speed up to 115200 bps
- Tx, Rx and power LED indicators
- Operating temperatures: -40°C to +75°C
- Compact size
- Dimensions: 55.4x20.3x11.85 mm
- 3 years warranty
- Customization of OEM is welcomed

</td></tr></tbody></table>

### Specifications  


<table border="1" id="bkmrk-redisage-pn-c37-c38-" style="border-collapse: collapse; width: 100%; height: 615.734px;"><colgroup><col style="width: 17.6761%;"></col><col style="width: 17.1817%;"></col><col style="width: 32.8801%;"></col><col style="width: 32.1384%;"></col></colgroup><thead><tr style="height: 35.3906px;"><td class="confluenceTh align-center" colspan="2" style="height: 35.3906px;">**Redisage PN**  
</td><td class="confluenceTh align-center" style="height: 35.3906px;">**C37**

</td><td class="confluenceTh align-center" style="height: 35.3906px;">**C38**

</td></tr></thead><tbody><tr style="height: 29.7969px;"><td class="confluenceTd" colspan="2" style="height: 29.7969px;">Ports</td><td class="confluenceTd align-center" style="height: 29.7969px;">UART</td><td class="confluenceTd align-center" style="height: 29.7969px;">RS232/RS485</td></tr><tr style="height: 10px;"><td class="confluenceTd" colspan="2" style="height: 10px;"><span class="legacy-color-text-blue3">Expanders</span></td><td class="confluenceTd align-center" style="height: 10px;">**C37EX**

USB-A adapter for UART

</td><td class="confluenceTd align-center" style="height: 10px;">**C38EX** DSUB-A adapter for RS232

</td></tr><tr style="height: 29.7969px;"><td class="confluenceTd" colspan="2" style="height: 29.7969px;">Power</td><td class="confluenceTd align-center" colspan="2" style="height: 29.7969px;"> &lt; 1 W</td></tr><tr style="height: 32.7969px;"><td class="confluenceTd" colspan="2" style="height: 32.7969px;">Frame ground protection</td><td class="confluenceTd align-center" colspan="2" style="height: 32.7969px;">no</td></tr><tr style="height: 35.3906px;"><td class="confluenceTd" colspan="2" style="height: 35.3906px;">Baud rate

</td><td class="confluenceTd align-center" colspan="2" style="height: 35.3906px;">up to 115200 bps

</td></tr><tr style="height: 29.7969px;"><td class="confluenceTd" colspan="2" style="height: 29.7969px;">LED indicators</td><td class="confluenceTd align-center" colspan="2" style="height: 29.7969px;">communication Tx, Rx and power</td></tr><tr style="height: 29.7969px;"><td class="confluenceTd" colspan="2" style="height: 29.7969px;">RS485 termination</td><td class="confluenceTd align-center" colspan="2" style="height: 29.7969px;">120 ohm Manually Enabled</td></tr><tr style="height: 33.4531px;"><td class="confluenceTd" rowspan="2" style="height: 68.0469px;">Connector  
</td><td class="confluenceTd" style="height: 33.4531px;">RS232/UART</td><td class="confluenceTd align-center" colspan="2" style="height: 33.4531px;">3-pin terminal block max. 2.5 mm<sup>2</sup> wire</td></tr><tr style="height: 34.5938px;"><td class="confluenceTd" style="height: 34.5938px;">RS485</td><td class="confluenceTd align-center" style="height: 34.5938px;">N/A</td><td class="align-center" style="height: 34.5938px;">2-pin terminal block max. 2.5 mm<sup>2</sup> wire</td></tr><tr style="height: 35.3906px;"><td rowspan="2" style="height: 160.344px;">Transmission  
distance

</td><td style="height: 35.3906px;">RS232/UART

</td><td colspan="2" style="height: 35.3906px;">max. 15 m at 115.2 kbps

</td></tr><tr style="height: 124.953px;"><td class="confluenceTd" style="height: 124.953px;">RS485

</td><td class="confluenceTd align-center" style="height: 124.953px;">N/A

</td><td style="height: 124.953px;">max. 1,200 m at 9.6 kbps; max. 400 m at 115.2 kbps  
(Belden 9841 2P twisted-pair cable, if different cables are used,  
the transmission distance may change)

</td></tr><tr style="height: 29.7969px;"><td class="confluenceTd" colspan="2" style="height: 29.7969px;">Mounting and enclosure</td><td class="confluenceTd align-center" colspan="2" style="height: 29.7969px;">DIN rail, plastic PA - UL 94 V0, black/green</td></tr><tr style="height: 29.7969px;"><td class="confluenceTd" colspan="2" style="height: 29.7969px;">Temperatures</td><td class="confluenceTd align-center" colspan="2" style="height: 29.7969px;">-40°C to +75°C operating and storage  
</td></tr><tr style="height: 29.7969px;"><td class="confluenceTd" colspan="2" style="height: 29.7969px;">Humidity</td><td class="confluenceTd align-center" colspan="2" style="height: 29.7969px;">10 - 90% RH, non-condensing</td></tr><tr style="height: 35.3906px;"><td class="confluenceTd" colspan="2" style="height: 35.3906px;">ESD protection

</td><td class="confluenceTd align-center" colspan="2" style="height: 35.3906px;"><span data-colorid="vp9zytj5st">±</span>4 kV contact discharge / <span data-colorid="c3eh79kytn">±</span>8 kV air discharge

</td></tr><tr style="height: 29.7969px;"><td class="confluenceTd" colspan="2" style="height: 29.7969px;">Certification</td><td class="confluenceTd align-center" colspan="2" style="height: 29.7969px;">CE, RoHS</td></tr></tbody></table>

### Variants  


#### C37 - UART 3V3 USB FTDI Converter  


<div drawio-diagram="267"><img src="https://doc.redisage.com/uploads/images/drawio/2024-04/drawing-10-1712144056.png" alt=""/></div>

#### C38 - RS232/RS485 USB FTDI Converter  


<div drawio-diagram="268"><img src="https://doc.redisage.com/uploads/images/drawio/2024-04/drawing-10-1712144087.png" alt=""/></div>

### Jumpers  


<div drawio-diagram="225"><img src="https://doc.redisage.com/uploads/images/drawio/2024-04/drawing-10-1712132971.png" alt=""/></div>

<table border="1" id="bkmrk-jumper-name-c38-jump" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 25.9877%;"></col><col style="width: 74.1359%;"></col></colgroup><thead><tr><td class="align-center">**Jumper name**</td><td class="align-center">**C38 jumpers**</td></tr></thead><tbody><tr><th class="confluenceTh align-left">E</th><td class="confluenceTd align-left">Echo Disable

</td></tr><tr><th class="confluenceTh align-left">A

</th><td class="confluenceTd align-left">Pull Up 523 ohm - A Line (RS485)</td></tr><tr><th class="confluenceTh align-left">B</th><td class="confluenceTd align-left">Pull Down 523 ohm - B Line (RS485)</td></tr><tr><th class="confluenceTh align-left">T</th><td class="confluenceTd align-left">120 ohm Termination</td></tr></tbody></table>

### Pin assignments  


<table border="1" id="bkmrk-pin-no.-c37-c38-1-nc" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 33.3745%;"></col><col style="width: 33.3745%;"></col><col style="width: 33.3745%;"></col></colgroup><thead><tr><td class="align-center">**Pin No.**

</td><td class="align-center">**C37**</td><td class="align-center">**C38**</td></tr></thead><tbody><tr><td class="confluenceTd align-left">1

</td><td class="confluenceTd align-left">NC</td><td class="align-left">Tx RS232</td></tr><tr><th class="confluenceTh align-left">2

</th><td class="confluenceTd align-left">VCC 3V3</td><td class="confluenceTd align-left">Rx RS232</td></tr><tr><th class="confluenceTh align-left">3</th><td class="confluenceTd align-left">GND</td><td class="confluenceTd align-left">GND</td></tr><tr><th class="confluenceTh align-left">4</th><td class="confluenceTd align-left">Tx UART 3V3</td><td class="confluenceTd align-left">A RS485</td></tr><tr><th class="confluenceTh align-left">5</th><td class="confluenceTd align-left">Rx UART 3V3</td><td class="confluenceTd align-left">B RS485</td></tr></tbody></table>

### Accessories  


<table border="1" id="bkmrk-c37%28ex%29-c38%28ex%29" style="border-collapse: collapse; width: 100%; height: 59.5938px;"><colgroup><col style="width: 50.0618%;"></col><col style="width: 50.0618%;"></col></colgroup><thead><tr style="height: 29.7969px;"><td class="align-center" style="height: 29.7969px;">**C37(EX)**</td><td class="align-center" style="height: 29.7969px;">**C38(EX)**</td></tr></thead><tbody><tr style="height: 29.7969px;"><td style="height: 29.7969px;">[![image (1).webp](https://doc.redisage.com/uploads/images/gallery/2024-04/scaled-1680-/image-1.webp)](https://doc.redisage.com/uploads/images/gallery/2024-04/image-1.webp)</td><td style="height: 29.7969px;">[![image (2).webp](https://doc.redisage.com/uploads/images/gallery/2024-04/scaled-1680-/image-2.webp)](https://doc.redisage.com/uploads/images/gallery/2024-04/image-2.webp)</td></tr></tbody></table>

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