User's Manual

Installation_________________________________________________ Boomer II User Manual & Integrator’s Guide
Wavenet Technology 36 BM210012WT27
If the modem is to be connected directly to a PC or other RS232
device, an interface must be provided to convert the signal voltage to
the higher values required by an RS232 device.
The protocol supported over this link is the Native Control Language
(NCL). The data format for NCL is: 8 data bits, no parity, 1 stop bit.
The serial interface lines (RXD, TXD, DCD, DTR, DSR, RTS, CTS,
RI) are TTL compatible. They are fitted with a 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:
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.