SkyWave IDP-782 - Rs-232; Ibutton Reader

IDP-782 - Hardware Guide
3.5.3 RS-232
The RS-232 interface defaults to the following settings: 9600 bit/s, 1 start, 8 data, 1 stop bit, and no parity.
The baud rate is configurable up to 115,200 bps.
The electrical characteristics of the interface are:
Parameter Min. Typical Max. Units
Rx Input Low Threshold for DTE Connected - - -2.7 V
Rx Input High Threshold for DTE Connected 2.7 - - V
Rx Threshold for DTE Disconnected -0.3 - 0.3 V
Serial Rx Input Low Threshold 0.6 - - V
Serial Rx Input High Threshold - - 2.4 V
Rx Input Voltage Range -25 - 25 V
Serial Tx Low Output (3 kΩ load) - - -3.7 V
Serial Tx High Output (3 kΩ load) 3.7 - - V
ESD Protection
Human Body Model - ±15 - kV
Contact Discharge Model - ±8 - kV
3.5.4 iButton Reader
The iButton 1-Wire interface allows connection to downstream 1-Wire devices connected on a bus, or to a
single button reader. Relative to any attached iButton device the terminal behaves as the master. The
iButton driver supports 3 or 5 V devices on the bus.
At standard speed, the iButton supports up to 39 devices over a 60 meter CAT5 cable. In overdrive, the
usable expected distance is reduced to ≤ 15 meters with a maximum node count of 9.
The electrical characteristics of the interface are:
Parameter Min. Typical Max. Units
Input High Voltage 1.8 - - V
Input Low Voltage - - 0.6 V
Output Low Voltage - - 0.2 V
Load Current @ 3 V - 4 - mA
ESD Protection
Human Body Model - ±27 - kV
T213, Version 02
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