USB-COM232-PLUS4 FTDI, USB-COM232-PLUS4 Datasheet - Page 7

• Manufacturer Part Number: USB-COM232-PLUS4
• Description: Interface Modules & Development Tools USB HS to RS232 Conv Assembly 4 DB9 Ports
• Manufacturer: FTDI

Specifications of USB-COM232-PLUS4

• Interface Type: USB, RS-232
• Data Bus Width: Serial
• Operating Supply Voltage: 5 V
• Product: Interface Modules
• For Use With/related Products: FT4232H
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: USB-COM232-PLUS-4

2
2.1
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.
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.
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.
DTE Pin Number
DTE Pin Number
Installation
Example Applications and Configurations
1
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
Signal Name
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
Signal Name
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
Copyright © 2010 Future Technology Devices International Limited
DCE Pin Number
DTE Pin Number
1
2
3
4
5
6
7
8
9
3
2
6
5
4
8
7
Document Reference No.: FT_000148
USB-COM232-PLUS4 Datasheet
Clearance No.: FTDI# 97
Version 1.2
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