Aurel 650200627 433MHz Radio Component 650200627 데이터 시트

제품 코드

650200627

WIZ-SML-IA

Instruction Manual

Technical features are subject to change without notice. AUR°EL S.p.A does not assume responsibilities for any damage caused by the device’s misuse.

AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana [FC] – ITALY Rev. A, 01-04-2002
Tel.: +390546941124 – Fax: +390546941660 Pag 3 di 3

http://www.aurel.it

- email:

aurel@aurel.it

Module usage

The RS232 connection takes place without parity control, 1 START bit, 8 DATA bit, 1 STOP bit. Before
forwarding the information to the RF, the User’s software must reduce it to packet not bigger than 96 bytes.

End Bytes are not required since the WIZ-SML-IA module considers an incoming string

terminated only when, for a 1.5 Byte time long, (and anyhow not less than 0,5 mS), no other

incoming Bytes are detected at the serial gate; this means that the Timeout's lapse varies
according to the Baud Rate speed chosen, by varying from a maximum of 1.6 mS (@ 9600 b/S)

to a minimum of 0.5 mS (@ 115200 b/S).

The RF transmission starts when the incoming data string is terminated.

Before sending a new data packet to the serial gate it is necessary to wait till the previous packet’s RF
transmission is over. All data entering the serial gate during the RF transmission forwarding phase, are

bound to be irremediably lost.

It is therefore suggested to the User that, during the administration software writing, to pay very much

attention to a correct timing of the data packets going out from the PC’s serial gate, specially when the
packets’ length is variable. Infact, if it is decided to forward a long packet followed by a short one, it is

necessary to wait all the time required by the RF transmission of the long packet before sending, to the

serial gate, the short one.

The packet's RF transmission time T is given by:

T = 3.6 mS + (NumByte+2) x 0.156 mS

Example #1 - Packet lenght: 1 Byte

Transmission time T= 4.1 milliseconds

Example #2 - Packet lenght: 32 Byte

Transmission time T= 8.9 milliseconds

Example #3 - Packet lenght: 96 Byte

Transmission time T= 18.9 milliseconds

It is suggested to add, precautionally, few mS to the RF transmission time between the dispatch of a packet

and the subsequent one.

The WIZ-SML-IA module is usually kept in RF reception and, once the incoming string reception is over, its
forwarding transmission takes place immediately through the serial gate (pin 5 of the Data Connector).

If the dip-switch 3 is in "close" position the forwarding transmission takes place even if errors are detected

on the single Bytes, while, if it is in "open" position the forwarding takes place exclusively if the checksum is

valid.