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Document Reference No.: FT_000148

USB-COM232-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 97

3 Connections

3.1 External Connectors

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

Power

VBUS – USB Power provided from upstream USB Host or Hub

Bidirectional

D– = USB data signal, negative polarity

Bidirectional

D+ = USB data signal, positive polarity

ID = Host /slave select pin ,No used

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

Input

DCD = Data Carrier Detect

Input

RXD = Receive Data

Output

TXD = Transmit Data

Output

DTR = Data Terminal Ready

Ground

GND = RS232 signal ground

Input

DSR = Data Set Ready

Output

RTS = Request To Send

Input

CTS = Clear To Send

Input

RI = Ring Indicator

Shield

Case Ground

Drain = typically connected to the host PC case

Table 3.2 – DE-9P RS232 Pin-Out

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 22 23

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