User's Guide

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Appendix C: S-Register
S-registers contain 52 parameters for the WCS-232 Series. 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 WCS-232 Series. Thus it is not recommended to change these S-registers.
Changing the values of S-register can only be done in the Standby mode. Turn WCS-232 off and on.
C.1. S1: Force to Reconnect (default 1)
S1=0, WCS-232 in Mode1 does not try to reconnect when disconnected.
S1=1, WCS-232 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, WCS-232 sends the received data immediately. When
this value is 0, the WCS-232 maximizes throughput, the WCS-232 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, WCS-232 will query only the BD address. This speeds up the inquiry process.
S4=1, WCS-232 will query the BD address, device name and class of device.
When this value is 1, WCS-232 finds not only BD address but also friendly name. When this value is 0,
WCS-232 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.