User's Manual

Appendix C: S-Register

S-registers contain 52 parameters for the IW05. These are stored in flash memory and the values will

be saved unless hardware reset is executed. The value of S-register can be accessed and changed

with ATS command. Some S-registers not shown below are set to maximize the performance of IW05.

Thus it is not recommended to change these S-registers.

Change the value of S-register only in Standby status. Turn IW05 off and on.

C.1. S1: Force to Reconnect (default 1)

S1=0, IW05 in Mode1 does not try to reconnect when disconnected.

S1=1, IW05 in Mode1 keeps trying to reconnect when disconnected.

C.2. 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

transmitting very small data quickly.

When this value is 1, in order to minimize latency, IW05 sends the received data immediately. When

this value is 0, the IW05 maximizes throughput, the IW05 stores received data for a short time and

sends a large 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 want to use high baud rate, throughput priority will be more effective. Just

for reference, the buffer length for receiving data is 2 Kbytes.

C.3. S4: Enable Remote Name Query (default 1)

S4=0, IW05 will query only the BD address. This speeds up the inquiry process.

S4=1, IW05 will query the BD address, device name and class of device.

When this value is 1, IW05 finds not only BD address but also friendly name. When this value is 0,

IW05 finds only BD address. When set to 0 this will make queries much faster. When using the pairing

button, finding friendly name will be omitted automatically.

C.4. S6: Enable Low Power Mode (default 0)

S6=0, deactivate Low Power Mode.

S6=1, activate Low Power Mode.

This value decides whether IW05 works in Low Power Mode or not. When this value is 0, IW05 works

only in active power mode. When this value is 1, IW05 will be in low power mode to save the power.

Therefore, it takes a few seconds to wake the IW05 out of low power mode.

C.5. S10: Enable Response Message (default 1)

S10=0, IW05 does not send response messages to the host system.

S10=1, IW05 sends response messages to host system.

This value decides whether IW05 sends response messages such as OK, ERROR, CONNECT,

DISCONNECT or not. When this value is 0, IW05 will not send any response messages. If the

response messages conflicts with your host programs or devices that is connected to IW05, change

this value to 0.

C.6. S11: Enable Escape (default 1)

S11=0, IW05 does not allow escape sequence characters. The operation status of Connect cannot be

changed to Standby. Since the IW05 skips the process of detecting escape sequence characters,

more efficient data transmission can be had.