Copyright © 2010 Future Technology Devices International Limited

11

Document Reference No.: FT_000148

USB-COM232-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 97

3 Connections

3.1.1 USB

The USB-COM232-PLUS4 is a downstream USB 2.0 High-speed Device. A standard USB Series “miniB”

receptacle is mounted inside the USB-COM232-PLUS4 to facilitate connection to an upstream USB Host or

Hub.

Pin Number

Pin Type

Description

1

Power

VBUS – USB Power provided from upstream USB Host or Hub

2

Bidirectional

D– = USB data signal, negative polarity

3

Bidirectional

D+ = USB data signal, positive polarity

4

ID

ID = Host /slave select pin ,No used

5

Ground

GND = USB signal ground

Shield

Case Ground

Drain = typically connected to the host PC case

Table 3.1 – USB "miniB" Receptacle Pin-Out

3.1.2 RS232

The RS232 port is configured as Data Terminal Equipment (DTE), with a 9-contact D-Sub Pin connector.

Pin assignments are according to TIA/EIA-574 which formally defines the assignments for a COM port

found on many personal computers.

Pin Number

Pin Type

Description

1

Input

DCD = Data Carrier Detect

2

Input

RXD = Receive Data

3

Output

TXD = Transmit Data

4

Output

DTR = Data Terminal Ready

5

Ground

GND = RS232 signal ground

6

Input

DSR = Data Set Ready

7

Output

RTS = Request To Send

8

Input

CTS = Clear To Send

9

Input

RI = Ring Indicator

Shield

Case Ground

Drain = typically connected to the host PC case

Table 3.2 – DE-9P RS232 Pin-Out