Datalogic STAR Modem Manuel d'utilisateur télécharger pdf (Page 61)

REFERENCES

Header Position

This parameter defines the header position within the frame to be transmitted from

STARModem™

to the Host. The header can be positioned in either the first field of

the frame or

in the field preceding the message:

FRAME

HEADER Address Address Delimiter MESSAGE

HEADER Time-Stamp Time-Stamp-Del Code Id Code Len DATA Terminator

The Address field has different meanings depending on if the FRAME is a 2 way

answer to a previous 2 way transaction initiated by a STARModem™ Client, or if it

is a new message that an RF device sends to the STARModem™ Server. See par.

5.4.2 for details.

5.4.2 Address Stamping

If enabled, this command includes the RF device or STARModem™ address in the

message/answer transmitted. It is advised to enable this parameter when

STARModem™ is a Server for more than one Client in 2 way transmission. In this

way the Host knows to which Client the answer must be sent.

If receiving

data from an RF device working in 1 way mode, STARModem™ (Server)

automatically includes the RF device address in the message to be sent to the Host.

If receiving

data from an RF device working in 2 way mode, STARModem™

(Server) automatically includes the RF device address in the message to be sent to

the Host. It is required to set the Host application to include the same address in the

answer to be transmitted back to the RF device.

Figure 20 - Receiving a Message from RF device in 2 Way Mode

RF Dev. Addr + message

RF Device

in 2 way mode

RF Dev. Addr + answer

message

Server

answer

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 79 80

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Datalogic STAR Modem Manuel d'utilisateur Page 61