Promi-SD User Manual – Appendix. B S-Register
B-2
Copyright © 2006 Sena Technologies, Inc. All rights reserved.
S-Register
S-registers contain 46 parameters of Promi-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 Promi-SD. Thus it is not recommended to change
these S-registers.
Change the value of S-register only in Standby status.
S1: Force to Reconnect (default 1)
S1=0, Promi-SD in Mode1 does not try reconnection when disconnected.
S1=1, Promi-SD in Mode1 keeps trying reconnection when disconnected.
S2: UART_FLOWCONTROL (default 0)
S2=0, Promi-SD’s hardware flow control is off.
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.
S4: Enable Remote Name Query (default 1)
S4=0, Promi-SD inquires only BD address. This speeds up the inquiry process.
S4=1, Promi-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.
S6: Enable Low Power Mode (default 0)
S10=0, deactivate Low Power Mode.
S10=1, activate Low Power Mode.
This value decides whether SD works in Low Power Mode or not. When this value is 0, SD works only in active power
mode. When SD works in Low Power mode, delay in transferring data may occur.
S10: Enable SD Response (default 1)
S10=0, Promi-SD does not send SD responses to host system.
S10=1, Promi-SD send SD responses to host system.
This value decides whether SD sends response messages such as OK, ERROR, CONNECT, DISCONNECT or not. When this
value is 0, SD sends no response messages. If the response messages cause troubles in host programs or devices that is
connected to SD, change this value to 0.
S11: Enable Escape (default 1)
