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Data Sheet

USB RS232 RS485 Converters (C37 & C38)

C37(EX) C38(EX)

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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
Ports UART RS232/RS485
Expanders

C37EX

USB-A adapter for UART

C38EX
DSUB-A adapter for RS232
Power  < 1 W
Frame ground protection no

Baud rate

up to 115200 bps
LED indicators communication Tx, Rx and power
RS485 termination 120 ohm Manually Enabled
Connector
 RS232/UART 3 pin terminal block max. 2.5 mm2 wire
RS485 N/A 2 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 enclosure DIN rail, plastic PA - UL 94 V0, black/green
Temperatures -40°C to +75°C operating and storage
Humidity 10 - 90% RH, non-condensing

ESD protection

±4 kV contact discharge / ±8 kV air discharge
Certification CE, RoHS

Variants

C37 - UART 3V3 USB FTDI Converter

C38 - RS232/RS485 USB FTDI Converter

Jumpers

Jumper name C38 jumpers
E

Echo Disable

A

 Pull Up 523 ohm - A Line (RS485)
B Pull Down 523 ohm - B Line (RS485)
T 120 ohm Termination

Pin assignments

Pin No.

 C37 C38

1

 NC Tx RS232

2

 VCC 3V3 Rx RS232
3 GND GND
4 Tx UART 3V3 A RS485
5 Rx UART 3V3 B RS485

Accessories

C37(EX) C38(EX)
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Enclosure dimensions

Compact USB Enclosure.

55.4 x 20.3 x 11.85

Units: mm.

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SR-D

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