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Document Reference No.: FT_000148

USB-COM232-PLUS4 Datasheet

Version 1.2

Clearance No.: FTDI# 97

2 Installation

2.1 Example Applications and Configurations

2.1.1 Wiring

Insert the A-plug into an available USB Host or Hub port. Insert the miniB-plug into the miniB-receptacle

on the USB-COM232-PLUS4.

RS232 cables have followed a standard 9-pin configuration on a D-sub connector since the mid 1980s.

The USB-COM232-PLUS4 follows this standard as a Data Terminal Equipment (DTE) device. If the RS232

equipment being connected is a Data Communication Equipment (DCE) device, it’s typical that a straight-

through cable can be used.

DTE Pin Number

Signal Name

DCE Pin Number

DCD = Data Carrier Detect

RXD = Receive Data

TXD = Transmit Data

DTR = Data Terminal Ready

GND = RS232 signal ground

DSR = Data Set Ready

RTS = Request To Send

CTS = Clear To Send

RI – Ring Indicator

Table 2.1 – RS232 DTE to DCE connection with straight-through cable

If the USB-COM232-PLUS4 is connected to another DTE device, a serial “null-modem” cable is required. A

null-modem cable handles connecting output signals to the corresponding input signals on the other end.

Table 2.3 shows a typical null-modem cable. Note that RI and DCD are not always used.

DTE Pin Number

Signal Name

DTE Pin Number

RXD = Receive Data

TXD = Transmit Data

DTR = Data Terminal Ready

GND = RS232 signal ground

DSR = Data Set Ready

RTS = Request To Send

CTS = Clear To Send

Table 2.2 – RS232 DTE to DTE connection with null-modem cable

Some serial devices may require certain handshake signals be connected. Refer to your device manual

for cabling details.

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