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参数资料
| 型号： | USB-RS485-WE-1800-BT |
| 厂商： | FTDI, Future Technology Devices International Ltd |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | CABLE USB RS485 WIRE END 1.8M |
| 产品培训模块： | USB-UART Interface Solutions |
| 产品目录绘图： | TTL-232R-5V-WE |
| 标准包装： | 10 |
| 系列： | USBmadeEZ-UART |
| 使用： | USB 至 RS485 |
| 转换源（适配器端）： | USB - A，插头 |
| 转换到（适配器端）： | 线缆，6 条电线引线 |
| 长度： | 5.90'（1.80m） |
| 屏蔽： | 无屏蔽 |
| 产品目录页面： | 633 (CN2011-ZH PDF) |
| 其它名称： | 768-1041 |
Document Reference No.: FT_000117
USB TO RS485 SERIAL CONVERTER CABLE Datasheet
Version 1.4
Clearance No.: FTDI #75
Parameter
Description
Minimum
Typical
Maximum
Units
Conditions
Receiver Input
VCM
Common-mode input
voltage range
-7
+12
V
1.0
VIN = +12V
IN
Input Current
– 0.8
mA
VIN = – 7V
VTH
VIHYST
RIN
DIfferential Threshold
Voltage,VTH
Input Hysteresis
Input Resistance, RIN
-0.2
12
20
15
+0.2
V
mV
kΩ
Transmitter Output
VOD
DIfferential Output Voltage,
dVOD
1.5
5
V
With RL = 54 Ω. CL = 50pF *
Table 5.3 USB-RS485-WE I/O Pin Characteristics
* - The 54 ohms is the equivalent of two 120 ohm termination resistors placed on each side of the
transmission line and the input impedance of 32 receivers on the line.
ESD HBM
Description
Conditions
RS-485 Inputs and
Minimum
Typical
±15 kV
Maximum
Outputs
EN61000-4-2ContactDischarge
EN61000-4-2AirGapDischarge
RS-485 Inputs and
Outputs
RS-485 Inputs and
±8 kV
±15 kV
Outputs
Table 5.4 USB-RS485-WE ESD Tolerance
5.4 Local Echo
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
s et for “TXDEN” local echo is disabled.
Users can set this with MPROG from www.ftdichip.com
The default for the local echo is disabled (CBUS4 set for “TXDEN).
Copyright ? 2010 Future Technology Devices International Limited
8
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