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5 Application Programming Interface
5.1 Serial Port
A half-duplex (0-3.0V) TTL asynchronous serial port (UART) is the primary interface to the user equipment. The serial
port operates with the serial parameters of 9600bps, 8 data bits, no parity, 1 stop bit.
The RX data input and the RTS inputs are 5V tolerant. The TX data and CTS outputs are 0-3.0V TTL.
RS232 input levels are not supported. RS232 data must be converted to TTL before being sent to the unit.
Each command from the DTE to the STINGR is sent in a serial packet. Upon receiving the command, the modem answers
to the DTE and, if applicable, executes the command.
In order to wake the STINGR from sleep mode and to indicate the end of the serial packet, each serial packet must be
framed by activating RTS before the first byte of the command and deactivating RTS after the last byte of the command.
STINGR pins
RTS
CTS
RxD
TxD
5.2 Serial Packet Mode
This mode is the legacy mode of operation as implemented in the STX2 and STX3 which consists of binary data packets.
Revision 0.2
06/24/15
Revision 0.2
< 125 ms
Command
1. Lower RTS
2. Wait for CTS to go low
3. Send Command to STINGR
4. Raise RTS
5. STINGR raises CTS
6. STINGR sends response
Subject To Change without Notice
STINGR Users Manual
< 25 ms
Response
P a g e
Host pins
TxD
RxD
| 16
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