# Passive RS232 RS485 Converters

# Data Sheet

## Passive RS232 RS485 Converters (C14)  


<table border="1" id="bkmrk-c14-features-interfa" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 50%;"></col><col style="width: 50%;"></col></colgroup><tbody><tr><td>**C14**

[![pol_pm_C14-Pasywny-mini-konwerter-RS232-na-RS485-83_1.png](https://doc.redisage.com/uploads/images/gallery/2024-03/scaled-1680-/pol-pm-c14-pasywny-mini-konwerter-rs232-na-rs485-83-1.png)](https://doc.redisage.com/uploads/images/gallery/2024-03/pol-pm-c14-pasywny-mini-konwerter-rs232-na-rs485-83-1.png)

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

- Interface feature: RS232C/RS485 standard interface compatible with EIA TIA
- Electric interface: RS232 end DB9 hole connector RS485 end terminal with connection pole
- Passive, anti-static
- Economical type
- Working mode: asynchronous half-duplex differential transmission
- Transmission media: twisted - pair
- Transmission rate: 300-115.2 kbps
- External discharge dimension: 56.3 mm x 33.5 mm x 15.8 mm
- Working circumstances: -25°C to 70°C
- Relative humidity: 5% to 95%
- Transmission distance: 1,200 m (RS485 end); 5 m (RS232 end)
- 2 years warranty
- Customization of OEM is welcomed

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

### Introduction

In remote data communication between a computer and peripheral equipment, it is often required to make an interconversion between standard serial interfaces. Compatible with RS232C / RS485 standards, the Passive Serial Converter can convert mono-end RS232 signal to differential RS485 signal and extend the communication distance up to 1.2 km.

No external power is needed as it adopts a RS232 charge pump to drive the system and gain electricity without initializing the RS232 serial interface. An internal zero delay auto transceiver and particular I/O circuits automatically control the data stream direction without any handshake signal (for example RTS, DTR, etc.). Thereby it guarantees to function under RS485 standard without changing the program compiled under RS232 half-duplex mode and assures the adaptation to a current operation software and interface hardware.

It implements multi-machine response communication and is commonly used in industrial automation control systems, all-one-card, access control systems, consumption systems, time and attendance systems, parking systems, self-service banking systems, bus charging systems, highway toll station systems and many more.

### Specifications

<table border="1" id="bkmrk-redisage-pn-c14-conv" style="border-collapse: collapse; width: 100%; height: 650.969px;"><colgroup><col style="width: 17.3053%;"></col><col style="width: 17.3053%;"></col><col style="width: 65.3894%;"></col></colgroup><thead><tr style="height: 29.7969px;"><td class="align-center" colspan="2" style="height: 29.7969px;">**Redisage PN**  
</td><td class="align-center" style="height: 29.7969px;">**C14**</td></tr></thead><tbody><tr style="height: 29.7969px;"><td colspan="2" style="height: 29.7969px;">Converter ports  
</td><td class="align-center" style="height: 29.7969px;">1 x RS232 &amp; 1 x RS485</td></tr><tr style="height: 29.7969px;"><td rowspan="2" style="height: 59.5938px;">Power  
</td><td style="height: 29.7969px;">Voltage</td><td class="align-center" style="height: 29.7969px;">passive</td></tr><tr style="height: 29.7969px;"><td style="height: 29.7969px;">Power</td><td class="align-center" style="height: 29.7969px;">&lt; 1 W</td></tr><tr style="height: 29.7969px;"><td colspan="2" style="height: 29.7969px;">Frame ground protection  
</td><td class="align-center" style="height: 29.7969px;">yes</td></tr><tr style="height: 29.7969px;"><td rowspan="2" style="height: 59.5938px;">Serial interface  
</td><td style="height: 29.7969px;">RS232</td><td class="align-center" style="height: 29.7969px;">TxD, RxD, GND</td></tr><tr style="height: 29.7969px;"><td style="height: 29.7969px;">RS485</td><td class="align-center" style="height: 29.7969px;">A, B</td></tr><tr style="height: 29.7969px;"><td colspan="2" style="height: 29.7969px;">Baud rate  
</td><td class="align-center" style="height: 29.7969px;">up to 115200 bps</td></tr><tr style="height: 29.7969px;"><td colspan="2" style="height: 29.7969px;">LED indicators  
</td><td class="align-center" style="height: 29.7969px;">N/A</td></tr><tr style="height: 29.7969px;"><td colspan="2" style="height: 29.7969px;">RS485 termination  
</td><td class="align-center" style="height: 29.7969px;">N/A</td></tr><tr style="height: 29.7969px;"><td rowspan="3" style="height: 93.0469px;">Connector  
</td><td style="height: 29.7969px;">RS232</td><td class="align-center" style="height: 29.7969px;">DB9 male connector</td></tr><tr style="height: 33.4531px;"><td style="height: 33.4531px;">RS485</td><td class="align-center" style="height: 33.4531px;">3-pin terminal block max. 2.5 mm<sup>2</sup> wire  
</td></tr><tr style="height: 29.7969px;"><td style="height: 29.7969px;">Power</td><td class="align-center" style="height: 29.7969px;">N/A</td></tr><tr style="height: 69.9844px;"><td rowspan="2" style="height: 99.7813px;">Transmission distance  
</td><td style="height: 69.9844px;">RS485</td><td class="align-center" style="height: 69.9844px;">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 style="height: 29.7969px;">RS232</td><td class="align-center" style="height: 29.7969px;">max. 15 m at 115.2 kbps  
</td></tr><tr style="height: 29.7969px;"><td colspan="2" style="height: 29.7969px;">Mounting and enclosure  
</td><td class="align-center" style="height: 29.7969px;">compact</td></tr><tr style="height: 29.7969px;"><td colspan="2" style="height: 29.7969px;">Temperatures</td><td class="align-center" style="height: 29.7969px;">-40°C to +75°C operating and storage  
</td></tr><tr style="height: 29.7969px;"><td colspan="2" style="height: 29.7969px;">Humidity</td><td class="align-center" style="height: 29.7969px;">10 - 90% RH, non-condensing  
</td></tr><tr style="height: 35.3906px;"><td colspan="2" style="height: 35.3906px;">ESD protection

</td><td style="height: 35.3906px;">±4 kV contact discharge / ±8 kV air discharge

</td></tr><tr style="height: 35.3906px;"><td colspan="2" style="height: 35.3906px;">Certification

</td><td style="height: 35.3906px;">CE, RoHS

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

#### Connector and signal

[![31d80de2-46e1-4e8a-bebf-3ff2badd41c6.png](https://doc.redisage.com/uploads/images/gallery/2024-04/scaled-1680-/31d80de2-46e1-4e8a-bebf-3ff2badd41c6.png)](https://doc.redisage.com/uploads/images/gallery/2024-04/31d80de2-46e1-4e8a-bebf-3ff2badd41c6.png)

#### RS232C pin distribution  


<table border="1" id="bkmrk-db9-female-%28pin%29-rs-" style="border-collapse: collapse; width: 100%;"><colgroup><col style="width: 50.0618%;"></col><col style="width: 50.0618%;"></col></colgroup><thead><tr><td data-colwidth="319">**DB9 Female (PIN)**

</td><td data-colwidth="440">**RS-232C Interface Signal**

</td></tr></thead><tbody><tr><td data-colwidth="319">1

</td><td data-colwidth="440">Protective

</td></tr><tr><td data-colwidth="319">2

</td><td data-colwidth="440">RXD SIN

</td></tr><tr><td data-colwidth="319">3

</td><td data-colwidth="440">TXD SOUT

</td></tr><tr><td data-colwidth="319">4

</td><td data-colwidth="440">DTR

</td></tr><tr><td data-colwidth="319">5

</td><td data-colwidth="440">GND

</td></tr><tr><td data-colwidth="319">6

</td><td data-colwidth="440">DSR

</td></tr><tr><td data-colwidth="319">7

</td><td data-colwidth="440">RTS

</td></tr><tr><td data-colwidth="319">8

</td><td data-colwidth="440">CTS

</td></tr><tr><td data-colwidth="319">9

</td><td data-colwidth="440">RI

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

#### RS485 data output &amp; connector and pin distribution  


<table border="1" id="bkmrk-db9-male-%28pin%29-data-" style="border-collapse: collapse; width: 100%; height: 176.953px;"><colgroup><col style="width: 33.3745%;"></col><col style="width: 33.3745%;"></col><col style="width: 33.3745%;"></col></colgroup><thead><tr style="height: 35.3906px;"><td class="align-center" data-colwidth="245" style="height: 35.3906px;">**DB9 Male (PIN)**

</td><td class="align-center" data-colwidth="204" style="height: 35.3906px;">**Data Output**

</td><td class="align-center" data-colwidth="309" style="height: 35.3906px;">**RS-485 Half Duplex**

</td></tr></thead><tbody><tr style="height: 35.3906px;"><td data-colwidth="245" style="height: 35.3906px;">1

</td><td data-colwidth="204" style="height: 35.3906px;">T/R+

</td><td data-colwidth="309" style="height: 35.3906px;">RS485 (A+)

</td></tr><tr style="height: 35.3906px;"><td data-colwidth="245" style="height: 35.3906px;">2

</td><td data-colwidth="204" style="height: 35.3906px;">T/R-

</td><td data-colwidth="309" style="height: 35.3906px;">RS485 (B-)

</td></tr><tr style="height: 35.3906px;"><td data-colwidth="245" style="height: 35.3906px;">3

</td><td data-colwidth="204" style="height: 35.3906px;">GND

</td><td data-colwidth="309" style="height: 35.3906px;">Ground wire

</td></tr><tr style="height: 35.3906px;"><td data-colwidth="245" style="height: 35.3906px;">4

</td><td data-colwidth="204" style="height: 35.3906px;">VCC

</td><td data-colwidth="309" style="height: 35.3906px;">9 VDC

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

### Applications  


#### C14 - Non-isolated (Passive)  


<div drawio-diagram="266"><img src="https://doc.redisage.com/uploads/images/drawio/2024-04/drawing-10-1712144016.png" alt=""/></div>

### Product dimensions  


[![1c961d11-16a2-4831-a737-f164c01a6a38.png](https://doc.redisage.com/uploads/images/gallery/2024-04/scaled-1680-/1c961d11-16a2-4831-a737-f164c01a6a38.png)](https://doc.redisage.com/uploads/images/gallery/2024-04/1c961d11-16a2-4831-a737-f164c01a6a38.png)

### Troubleshooting

#### Data communication failure

- Check if the RS232 interface connection is correct.
- Check if the RS232 output connection is correct.
- Check if the connection ends are well-connected.

#### Data loss or mistake

- Check if the data rate and format are consistent on both communication ends.

### Additional notes  


<table border="1" id="bkmrk-related-information-" 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" colspan="3">**Related information and links**  
</td></tr></thead><tbody><tr><td class="align-center">[Ordering information](https://redisage.com/en/delivery.html)</td><td class="align-center">[Accessories](https://redisage.com/eng_m_Accessory-174.html)</td><td class="align-center">[Similar products](https://redisage.com/search.php?text=+&sort=name&order=a)</td></tr></tbody></table>

### Products family sample photo  


<div drawio-diagram="557"><img src="https://doc.redisage.com/uploads/images/drawio/2024-04/drawing-10-1714134602.png" alt=""/></div>

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#### Datasheet-ID: 

SR-D

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