USB2-H-5002 EasySync, USB2-H-5002 Datasheet - Page 17

• Manufacturer Part Number: USB2-H-5002
• Description: USB Interface IC Hi-speed USB to 2prt Serial RS485 Adapter
• Manufacturer: EasySync

Specifications of USB2-H-5002

• Rohs: yes

3.1.2 RS485
The RS485 port is configured as Data Terminal Equipment (DTE), with a 9-contact D-Sub Pin connector.
Pin assignments are according to TIA/EIA-485. In addition, Pin9 of this connector can provide +5VDC to
an external device with a maximum current draw of 250mA once the USB2-H-5002 has been enumerated
by the system.
Table 3.2 – DE-9P RS485 Pin-Out
Pin Number
1
2
3
4
5
6
7
8
9
PWR = +5V DC output
GND = signal ground
Input/Output
Input/Output
Pin Type
Output
Input
Input
N/A
N/A
USB2-H-5002 Hi-Speed USB to 2-Port RS485 Adapter Data Sheet
©2010 EasySync Ltd.
Description
H-5002 is the first or last device in a multi-drop RS485 System,
H-5002 is the first or last device in a multi-drop RS485 System,
Pin 2 of 120R Terminating Resistor. Only Required if the USB2-
Pin 1 of 120R Terminating Resistor. Only Required if the USB2-
Pin 7 of the local echo control. Connect to pin 8 of the echo
Connect to pin 7 of the echo control to disable local echo.
control to disable local echo. Default is that local echo is
to meet RS485 Termination Requirements.
to meet RS485 Termination Requirements.
Default is that local echo is enabled.
Document Reference No.: ES_000020
enabled.
DATA+
DATA-
GND
PWR
N/A
N/A
Clearance No.: ES
Version 1.2
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