USB-COM485-PLUS-4 FTDI, USB-COM485-PLUS-4 Datasheet - Page 8

• Manufacturer Part Number: USB-COM485-PLUS-4
• Description: MODULE, DEV, USB-RS485, 4 COM PORT
• Manufacturer: FTDI
• Type: Developmentr

Specifications of USB-COM485-PLUS-4

• Mcu Supported Families: FT232R, FT2232, FT232BM
• Kit Features: Works With USB 1.1 & 2.0 Host And Hub Ports, FIFO
• Svhc: No SVHC (18-Jun-2010)
• 2.0 Host And Hub Ports, Fifo: 2KB Transmit Buffer, 2KB Receive Buffer
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2
2.1
2.1.1 Wiring
Insert the A-plug into an available USB Host or Hub port. Insert the mini B-plug into the mini B-
receptacle on the USB-COM485-PLUS4.
Table 2.1 – RS485 DTE to DCE connection
Figure 2.1 USB-COM485-PLUS4 Termination resistor.
DTE Pin Number
Installation
Example Applications and Configurations
1
2
3
4
5
6
7
8
9
Signal Name
DATA- = Transmit/Receive
Data, negative polarity
Also Terminator 2
DATA+ = Transmit/Receive
Data, positive polarity
Terminator 1
N/A
GND = signal ground
N/A
echo disable terminal 1
echo disable terminal 2
PWR = +5V DC output
Copyright © 2010 Future Technology Devices International Limited
Pin 2 of 120R Terminating Resistor. Only Required if the USB-
COM485-PLUS4 is the first or last device in a multi-drop RS485
System, to meet RS485 Termination Requirements.
Pin 1 of 120R Terminating Resistor. Only Required if the USB-
COM485-PLUS4 is the first or last device in a multi-drop RS485
System, to meet RS485 Termination Requirements.
Local echo function control. Connect pin7 and pin 8 can disable
Local echo function control. Connect pin7 and pin 8 can disable
the local echo function. The local echo is enabled by default.
the local echo function. The local echo is enabled by default.
Expected Connect Signal
DATA+
DATA-
GND
PWR
Document Reference No.: FT_000153
N/A
N/A
USB-COM485-PLUS4 Datasheet
Clearance No.: FTDI# 108
Version 1.2
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