DB-II Serial Communication Protocol                                                           

DB-II Serial Communication Protocol

Revision 0.2(English)

Final Revision: 2005. 4. 25

< Table of Contents >

1.              The Serial Interface              3

1.1.              Transmission Control Character              3

1.2.              Synchronization              3

1.3.              The Wire Connection              4

1.4.              PC to Scale (Client to Server)              5

1.4.1.              Command Format              5

1.4.2.              Key Command              5

1.4.3.              Download Command              6

1.4.4.              Data Request Command              7

1.5.              Scale to PC (Server to Client)              8

1.5.1.              Acknowledge              8

1.5.2.              No Acknowledge              8

1.5.3.              Data Format              8

1.5.4.              Examples              9

2.              Scheme              10

2.1.              Normal Operation              10

2.2.              Key Command Operation              11

1.     The Serial Interface

  Definition of Scale and PC serial interface protocol communication

1.1.   Transmission Control Character

[Table 1.1] Transmission Control Character

[Table 1.1] control character

Synchronization

[Figure 1.1] Synchronization Packet

First and end Packet is like following [Figure 1.1]

Prefix 2 byte reads first Packet, and Suffix 3 byte reads the last part of Packet.

[LEN]Suffix is 1byte which counts [SOH] to [EOT] byte

1.2.   The Wire Connection

[Figure 1.2] Arrangement connector pin of Scale (DSUB)

As [Figure 1.2] shown DB-II is wire connected with D-SUB connector and Main board.

TX, RX is connected to communicate with other RX, TX.

Connecting DB-II, PC, and DEP printer needs to make a cable which connected with DB-II’s 7th ground cable, and PC, DEP printer’s 5th cable.

1.3.   PC to Scale (Client to Server)

1.3.1.    Command Format

[Figure 1.3] Command Format (PC to Scale)

As [Figure 1.3] shows PC to Scale Packet format.

This command format organized with; Start notice Prefix 2 byte, Scale ID and Key command 1byte, general command 2byte, and Date (0) or (4) or (8) byte.

Scale setting data becomes a parameter value.

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