ZULU Modem
Pin Descriptions:
RX, TX
This is the Data Input / Output. Data is transmitted and received at the low voltage level
(dependant on Vcc being used).
Serial Data Format
Baud Rate:
Defined by DR1 and DR2 Pins
Data Bits:
8
Parity:
None
Stop Bits:
1
Flow Control:
Hardware CTS / RTS
CTS, RTS
Clear to Send and Request to Send are standard data flow control as use in RS232 systems,
these are standard but operate at the Zulu Vcc low level voltage.
RESET
Connection to GND Resets the Zulu Module. Zulu Modem starts up when this input is taken
from GND to Vcc.
Normal operation: connect to Vcc through a 10Kohm Resistor
Vcc:
Supply Voltage (2.2—3.6V)
DR1 - DR2
These inputs define the host interface Baud Rate. They are read when RESET pin goes high.
Tip: It is good practice to operate the host interface at half the speed of the RF data rate (set
by Register R5
DR1
Open
Fitted
Open
Fitted
DR2
Open
Open
Fitted
Fitted
Host Baud Rate
4,800
9,600
19,200
38,400
PD
This input enables ‘Sleep’ Mode. For normal operation connect to Vcc. No RF packets will be
received by the module when it is in sleep mode.
WRE
Controls where the User configuration parameters are saved in EEPROM (Non-Volatile) or
RAM (Volatile) Un-used.
Tx / Rx LED
Direct LED Drive which operates whenever there is RF activity.
XTAL1, XTAL2
The Zulu module requires a 30MHz drive Crystal to be connected between XTAL1-2
Any standard crystal +/-10ppm ~20pF such as FEC 184-2247.
DS-ZULU Modem-1
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