User manual

WiSnap User Manual 4.41 10202014-ML
Page 8
Even if there is a “user” config file arming and toggling this switch nine (9) times will override the “user” settings and restore
the WiSnap module to the factory hardcoded defaults. This is a bypass mechanism in case a bad configuration is saved into
the “user” file.
Switches 2, 3, and 4 are currently not used.
2.6.3 Serial Connector Specification
DB9 connector Pin Out
Pin
WiSnap AAA Male
DB9
WiSnap AAA Female
DB9
1
NC
NC
2
RXD
TXD
3
TXD
RXD
4
DTR (=PIO7)
DON’T USE
5
GND
GND
6
DSR (=PIO8)
5V DC (input)
7
RTS
CTS
8
CTS
RTS
9
5V DC Only
5V DC Only
 NOTE: The RS232 interface uses the SIPEX SP3232ECA chip with capacitor switch to generate the + and – signals and
thus is not driving the full RS232 voltages. Devices stealing power from the RS232 pins may not have enough voltage.
2.6.4 Null-modem and Flow Control Jumpers
The WiSnap AAA Dongle serial interface can be configured to enable flow control and null modem signaling. The jumper block
can be accessed by removing the battery cover from the WiSnap AAA Dongle.
 WARNING: Flow control signals are NOT RS-232 signaling tolerant. If these are enabled with the jumper, do not
exceed 3.3 VDC or permanent damage can occur.