Datasheet

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 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
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