Datalogic-scanning DL Cordless Card DLCC Manual de usuario descargar pdf (Pagina 32)

DL CORDLESS CARD™

Case 3 – DLCC as Client / Server

Client

Server

HOST 1

HOST 2

Figure 7 – DLCC as Client / Server

Both DLCCs are able to communicate bi-directionally. For analysis purposes only, we

assume the situation where Host 1 is Client and Host 2 is Server. It is clear that the

situation is analogous in the opposite direction:

• If DLCC 1 - Transmission Mode = 1 way

ACK/NACK from Remote Host = disabled

FIFO = enabled

Handshaking = any

The Client, (Host 1) sends a message to the Remote Host (Host 2), but no

control exists upon reception and even if ACK/NACK Protocol is implemented on

the Server side (Remote Host), no answer is returned from DLCC 2 to DLCC 1.

This is not a secure communication.

• If DLCC 1 - Transmission Mode = 1 way

ACK/NACK from Remote Host = enabled

FIFO = enabled

Handshaking = any

The Client, (Host 1) sends a message to the Remote Host (Host 2). DLCC 2

acknowledges good radio reception but no control is made on Remote Host

reception. If DLCC 2 acknowledges radio reception within the Radio Protocol

Timeout, DLCC 1 sends ACK to its local Host, otherwise it sends NACK.

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Datalogic-scanning DL Cordless Card DLCC Manual de usuario Pagina 32