User's Manual

Boomer II User Manual & Integrator’s Guide _________________________________________________Installation
BM210012WT27 37 Wavenet Technology
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 transmit ready Input Low when ready
6
DSR
Data set ready Output Low when ready
7
RTS
Request to send
Input High when host requires data
throttling
8
CTS
Clear to send
Output High when modem requires
data throttling
9
RI
Ring indicator
Output Pulses Low when messages
are waiting
Status Input / Output lines
Note: Not currently supported but may be added in future releases.
The status lines (SS0 to SS3) may be software configured for bi-
directional operation. Each line has a 100kΩ pull-up resistor, 33Ω
series resistor and clamp diode to the internal supply line for
protection. The electrical interface capability, equivalent circuit and
operation of these lines is summarized in the tables below:
Status Input/Output Equivalent Circuit
Status Input/Output 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)