DCE

Features

• TTL to RS-232 converter
  • Tx/RX/RTS/CTS
• Female DB-9 connector
• FTDI pinout (reversed directions to directly connect to FTDI Interface)
• Up to 115,200 baud @ 5V
• Up to 250,000 baud @ 3.3V
• 49x49mm card
• 4x 4-40 holes

DCE - RS-232 to TTL

• The DCE (peripheral) has the female DB-9 connector

• The DTE (PC) has the male DB-9 connector

Connectors

H1 Connector

• Pins signal directions are reversed from an FTDI card
  • Can be directly wired to FTDI connector

Pinout

1. GND
2. CTS (out)
3. VCC (3.3V or 5V)
4. TX (in)
5. Rx (out)
6. RTS (in)

H2 - Power

• 2x4 right angler header

Test Procedure

• FTDI-49MM
  • 3.3V/5V jumper set to 5V
  • Power cable from FTDI-49MM 5V Connector split to both DCE/DTE cards
• DCE/DTE Cards
  • 9 pin connectors plugged together
• FTDI loopback cable
  • TX/RX connected
  • RTSCTS connected
• USB B cable to PC
• Run PuTTY
  • 115,200 baud, RTS/CTS
• Type and it comes back

SP232A Application

• SP232ACN-L is 5V part
• ICL3232IBNZ is 3.3V or 5V part

DTE (reference)

• The DTE (PC) has the male connector
• RS-232 Breakout Card

DCE Assembly Sheet

• DCE Assembly Sheet