Appendix C: S-Register - Sena Parani-SD100 User Manual

Appendix C: S-Register

S-registers contain 46 parameters of Parani-SD. These are stored in flash memory and sustained the
values unless hardware reset is executed. The value of S-register can be accessed and changed with
ATS command by user. Some S-registers not shown below are set to maximize the performance of
Parani-SD. Thus it is not recommended to change these S-registers.
Change the value of S-register only in Standby status.
C.1. S1: Force to Reconnect (default 1)
S1=0, Parani-SD in Mode1 does not try reconnection when disconnected.
S1=1, Parani-SD in Mode1 keeps trying reconnection when disconnected.
C.2. S2: Enable Hardware Flow Control (default 1)
S2=0, Parani-SD's hardware flow control is off.
S2=1, Parani-SD's hardware flow control is on.
In case of SD Series, it can be changed only through dip switch.
C.3. 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
transmiting very small data quickly.
This value decides the way of handling stream data from UART. When this value is 1, in order that SD
minimizes the latency, SD sends the received data immediately. When this value is 0, in order that SD
maximizes throughput, SD stores received data for a short time and sends a large packet. If the
packet length is less than100 bytes, latency-oriented way is better. But if the packet length is more
than 100 bytes, throughput-oriented way is recommended. Also if you want to use high baudrate,
throughput-oriented way is more effective. Just for reference, the buffer length for receiving is 2 Kbytes.
C.4. S4: Enable Remote Name Query (default 1)
S4=0, Parani-SD inquires only BD address. This speeds up the inquiry process.
S4=1, Parani-SD inquire BD address, device name and class of device.
This value decides whether SD finds friendly name of Bluetooth device or not. When this value is 1,
SD finds not only BD address but also friendly name. When this value is 0, SD finds only BD address.
Without finding friendly name, a searching is quick to respond. If you want to search the other
Bluetooth devices quickly, set this value to 0. In case of using pairing button, finding friendly name will
be omitted automatically.
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