User Manual
Eddy User's Guide
90
7.1.5 : S-Register
S-registers contain 52 parameters for the Eddy-BT. These are stored in flash memory and the values will be sa
ved unless hardware reset is executed. The value of S-register can be accessed and changed with ATS comm
and. Some S-registers not shown below are set to maximize the performance of Eddy-BT. Thus it is not reco
mmended to change these S-registers.
Change the value of S-register only in Standby status. Turn Eddy-BT off and on.
S1: Force to Reconnect (default 1)
S1=0, Eddy-BT in Mode1 does not try to reconnect when disconnected.
S1=1, Eddy-BT in Mode1 keeps trying to reconnect when disconnected.
S3: Stream UART Policy (default 0)
S3=0, the priority of UART streaming is throughput.
S3=1, the priority is latency, which minimizes the delay of data transmission. This is useful in case of transmitti
ng very small data quickly.
When this value is 1, in order to minimize latency, Eddy-BT sends the received data immediately. When this va
lue is 0, the Eddy-BT maximizes throughput, the Eddy-BT stores received data for a short time and sends a la
rge data packet. If the packet length is less than 100 bytes, having latency being the priority is recommended.
If the packet length is more than 100 bytes, having throughput as the priority is recommended. Also, if you wa
nt to use high baud rate, throughput priority will be more effective. Just for reference, the buffer length for recei
ving data is 2 Kbytes.
S4: Enable Remote Name Query (default 1)
S4=0, Eddy-BT will query only the BD address. This speeds up the inquiry process.
S4=1, Eddy-BT will query the BD address, device name and class of device.
When this value is 1, Eddy-BT finds not only BD address but also friendly name. When this value is 0, Eddy-B
T finds only BD address. When set to 0 this will make queries much faster. When using the pairing button, fin
ding friendly name will be omitted automatically.
S6: Enable Low Power Mode (default 0)
S6=0, deactivate Low Power Mode.
S6=1, activate Low Power Mode.
This value decides whether Eddy-BT works in Low Power Mode or not. When this value is 0, Eddy-BT works
only in active power mode. When this value is 1, Eddy-BT will be in low power mode to save the power. Ther
efore, it takes a few seconds to wake the Eddy-BT out of low power mode.