User's Manual

Installation_________________________________________________ Boomer II User Manual & Integrator’s Guide
Copyright Wavenet Technology © November 2003 34 BM210012WT37
Serial Communications Equivalent Circuit
Serial Communications Electrical Characteristics
Parameter Range Low High
Input Voltage 0-3.3 V OR 0-5V 0.8 V (max) 2.5 V (min)
Output Voltage 0 – 3.3 V 0.5 V (max) 2.3 V (min)
Input Current 100 µA (max) 100 µA (max)
Output Current 3.2 mA (max) 1.6 mA (min)
Note: DCD and INRANGE outputs share the same output line from the
micro-processor , and therefore the combined current consumption of
that line must not exceed 2mA.
Serial Communications Interface Definitions
J1
Pin #
Signal Description Signal Active State
1 DCD Data Carrier Detect Output Low when modem in-range
2 RXD Receive Data Output Low when active
3 TXD Transmit Data Input Low when active
4 DTR Data Terminal Ready Input Low when ready
6 DSR Data set ready Output Low when ready
7 RTS Request to send
Input High when host/terminal
requires data throttling
8 CTS Clear to send Output High when modem requires
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