USB-RS485-WE-1800-BT FTDI, USB-RS485-WE-1800-BT Datasheet - Page 9

• Manufacturer Part Number: USB-RS485-WE-1800-BT
• Description: Cables (Cable Assemblies) USB to RS485 Embeded Conv Wire End 1.8m
• Manufacturer: FTDI

Specifications of USB-RS485-WE-1800-BT

• Product: USB to Serial Assemblies
• Number Of Conductors: 6
• Wire Size (awg): 24
• Connector End A: USB Type A Plug
• Connector End B: Wire End
• Length: 1.8 m
• Cable Type: USB to RS-485 Serial Converter Cable
• Description/function: USB to Serial Cable Assembly
• Equipment Type: USB to Serial Cable Adapter
• Voltage Rating: 5 V
• Color: Black
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Parameter
Receiver Input
Transmitter Output
Table 5.3 USB-RS485-WE I/O Pin Characteristics
* -
transmission line and the input impedance of 32 receivers on the line.
ESD HBM
EN61000-4-2ContactDischarge
EN61000-4-2AirGapDischarge
Table 5.4 USB-RS485-WE ESD Tolerance
5.4
RS485 systems often have local echo enabled. This means any data transmitted by a device is echoed
back to itself.
The USB-RS485-WE cable allows for local echo to be enabled/disabled by changing a bit in the FT232R
EEPROM. If CBUS4 in the EEPROM is set for “PWRON#” local echo is enabled. If CBUS4 in the EEPROM is
set for “TXDEN” local echo is disabled.
Users can set this with MPROG from
The default for the local echo is disabled (CBUS4 set for “TXDEN).
VIHYST
VOD
VCM
VTH
RIN
IN
The 54 ohms is the equivalent of two 120 ohm termination resistors placed on each side of the
Local Echo
Description
Common-mode input
voltage range
Input Current
DIfferential Threshold
Voltage,VTH
Input Hysteresis
Input Resistance, RIN
DIfferential Output Voltage,
dVOD
Description
Copyright © 2010 Future Technology Devices International Limited
Conditions
RS-485 Inputs and
Outputs
RS-485 Inputs and
Outputs
RS-485 Inputs and
Outputs
www.ftdichip.com
Minimum
-0.2
1.5
12
-7
Typical
20
15
USB TO RS485 SERIAL CONVERTER CABLE Datasheet
Maximum
+0.2
–0.8
+12
1.0
5
Minimum
Units
mA
mV
kΩ
V
V
V
Document Reference No.: FT_000117
VIN = +12V
VIN = –7V
With RL = 54Ω. CL = 50pF *
±15 kV
±15 kV
Typical
±8 kV
Clearance No.: FTDI
Conditions
Maximum
Version 1.4
8
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