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Document Reference No.: FT_000117
USB TO RS485 SERIAL CONVERTER CABLE Datasheet
Version 1.4
Clearance No.: FTDI #75
5.2 USB-RS485-WE Cable Signal Descriptions
Colour
Black
Name
GND
Type
GND
Description
Device ground supply pin.
Pin 1 of 120R Terminating Resistor. Only Required if
Brown
Terminator 1
Input
the USB-RS485-WE cable is the first or last device
in a multi-drop RS485 System, to meet RS485
Termination Requirements.
Default output is +5V when active, 0V during
suspend.
Red
POWER
Output
Power output can be customized to 0V, if required,
contact FTDI Sales Team (sales1@ftdichip.com) .
Switchable power to external device, 250mA max.
OFF during suspend
Orange
Yellow
Data+(A)
Data-(B)
Bi-Direction
Bi-Direction
Data + (A) Signal
Data - (B) Signal
Pin 2 of 120R Terminating Resistor. Only Required if
Green
Terminator 2
Input
the USB-RS485-WE cable is the first or last device
in a multi-drop RS485 System, to meet RS485
Termination Requirements.
Table 5.1 USB-RS485-WE Cable Signal Descriptions
5.3 USB-RS485-WE Electrical Parameters
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
This only applies when
cable has been configured to
VCC_5V
Output Power Voltage*
4.25
5.0*
5.25
V
output 5V. The range is
dependent on the USB port
that the USB-RS485-WE is
connected to
C
I O
T
Output Power Current***
Operating Temperature
Range
-
-40
250
+85
mA
o
Must be less that 2.5mA
during suspend.
Table 5.2 USB-RS485-WE I/O Operating Parameters
*Default is 5V.
***Only applies when POWER output is 5V.
Copyright ? 2010 Future Technology Devices International Limited
7
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