accurately. If connected in wrong way, the output port of the indicator or the input port of computer communication will be damaged, and sometimes the damage will happen to the indicator, computer and peripherals.

▲! Special computer operation skills and programming ability is required for computer communication operation, which shall be performed and directed by qualified service personnel only. Non-professionals are supposed to be out of connection operation.

1.The communication port adopts the 15-pin plug (jointly used with the scoreboard). Pins layout and definition is shown in Figure 6: 6,7,8 (RS232) , and, 1,2,3,4(RS422/485)

2.All datum are ASCII and each set is composed of 10 bits：1 start bit, 2-9 data bit, 10 stop

bit.

Communicating methods are classified as follows:

1). In Sequence:

The data transmitted is the present weight displayed (gross or net), each frame of datum is composed of 14 sets of datum. Hereunder is the format:

Byte Serial Number

 

Descriptions

1

02H(XON)

begin

2

+ or -

symbol bit

3

Weighing data

high bit

…

Weighing data

…

…

Weighing data

…

10

Weighing data

low bit

11

Decimal

from right to left (0～4)

12

XOR verifying

high 4 bits

13

XOR verifying

low 4 bits

14

03H(X0FF)

end

XOR=2 ⊕ 3 ⊕ 4 …8 ⊕ 9

2). Instruction method

The indicator transmits the corresponding data according to the instruction of upper computer. One frame of datum will be transmitted every time when upper computer send one instruction. Hereunder is the instruction transmitted:

Byte Serial Number

 

Descriptions

1

02H(XON)

begin

2

A～Z

address serial number

3

A～B

order A: Handshaking

 

 

Order B: Read the displayed weight

 

 

 

 

 

 

4

XOR verifying

high 4 bits

5

XOR verifying

low 4 bits

6

03H (X0FF)

end

XOR= 2 ⊕ 3

 

 

The output content of indicator:

 

Byte Serial Number

 

Descriptions