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In order to confirm that the device is operating correctly there is an indicate function installed.
By looking at the flash of the LED you can check the state of communication.
There are 2 flashing speeds, during standby on the secondary channel there is no flashing. If the primary
channel commences discovery, it will flash once every 3 seconds (for approx. 0.7 seconds). After
discovering the other device and communication becomes possible it will flash every 0.4 seconds.
Operating condition LED
during connection standby Low
during discovery low speed
flashing
flashing once every 3 seconds
(for approx. 0.7 seconds)
during communication with
other device
high speed
flashing
switches from High to Low every 0.4
seconds
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D-sub 9-pin Male connector: (RS-232C)
*** Electricity source:
a) With Voltage Regulator b) Without Voltage Regulator
(U6_ is placed, R25 is removed) (U6_ is removed, R25 is placed)
AC Adaptor DC 7.5V / 300mA above DC 5V / 450mA above, stable source.
+ DC 5V
– Gnd
Pin No. Name Descriptions I/O
1 DCD Data Carrier Detect I
2 RxD Receiver Data I
3 TxD Transmitter Data O
4 DTR Data Terminal Ready O
5 GND Signal Ground Gnd
6 DSR Data Set Ready I
7 RTS Request to Send O
8 CTS Clear to Send I
9 RI Ring Indicator I