# USB FTDI Converters Data Sheet ## USB RS232 RS485 Converters (C37 & C38)
**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)** **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
### Specifications
**Redisage PN** **C37** **C38**
PortsUARTRS232/RS485
Expanders**C37EX** USB-A adapter for UART **C38EX** DSUB-A adapter for RS232
Power < 1 W
Frame ground protectionno
Baud rate up to 115200 bps
LED indicatorscommunication Tx, Rx and power
RS485 termination120 ohm Manually Enabled
Connector RS232/UART3-pin terminal block max. 2.5 mm2 wire
RS485N/A2-pin terminal block max. 2.5 mm2 wire
Transmission distance RS232/UART max. 15 m at 115.2 kbps
RS485 N/A 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)
Mounting and enclosureDIN rail, plastic PA - UL 94 V0, black/green
Temperatures-40°C to +75°C operating and storage
Humidity10 - 90% RH, non-condensing
ESD protection ±4 kV contact discharge / ±8 kV air discharge
CertificationCE, RoHS
### Variants #### C37 - UART 3V3 USB FTDI Converter
#### C38 - RS232/RS485 USB FTDI Converter
### Jumpers
**Jumper name****C38 jumpers**
EEcho Disable
A Pull Up 523 ohm - A Line (RS485)
BPull Down 523 ohm - B Line (RS485)
T120 ohm Termination
### Pin assignments
**Pin No.** **C37****C38**
1 NCTx RS232
2 VCC 3V3Rx RS232
3GNDGND
4Tx UART 3V3A RS485
5Rx UART 3V3B RS485
### Accessories
**C37(EX)****C38(EX)**
[![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)[![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)
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