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6.6 Changing Units of Measurement

The WTTM can display force measurements in any of the following three engi-

neering units:

■ lbf (pounds)

■ N (Newtons)

■ Kgf (kilograms)

To change the selected engineering units for display press UNITS key. Each

time the key is pressed, the units will change from one to the other as follows:

Lbf

Kgf

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SPECIFICATION

Baud rate 2400, 4800; 9600 or 19200 (selectable, see general settings)

Data length 8 bits

Stop bit 1

Parity None

PROTOCOL CODE

Extern >> AAcr Tare

ABcr Stop Output

ACcr Change to Peak Mode

ADcr Change to Average Mode

AEcr Reset Peak

AFcr Change Units to kg (g)

AGcr Change Units to N

AHcr Change Units to lb (oz)

BAcr Data output request (single reading)

BBcr Data output request (10/sec)

BB1cr Data output request (20/sec)

BB2cr Data output request (50/sec)

BB3cr Data output request (100/sec)

BDcr Units confirmation request

BEcr Peak data output request

BFcr Minus peak data output request

cr (carriage return)

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8.0 DATA TRANSFER

Model WTTM testers can transfer measuring data by means of an RS-232C interface.

A 9-pin D-Sub connector is provided for this purpose, which can be found at the left

side of the instrument. A connector cable for the serial port is included. If a custom

serial cable must be used or if the user wishes to access the analog output, the pin

designations are as follows:

8.1 RS-232C Interface

The RS-232C interface can be used for the direct communication between an

appropriate serial I/O-card of a computer and the instrument. The minimum

requirement for the data transfer up to 19200 baud is the connection of the

RXD, TXD and GND communication terminal.

SPECIFICATION

Baud rate 2400, 4800; 9600 or 19200 (selectable, see general settings)

Data length 8 bits

Stop bit 1

Parity None

PROTOCOL CODE

Extern >> AAcr Tare

ABcr Stop Output

ACcr Change to Peak Mode

ADcr Change to Average Mode

AEcr Reset Peak

AFcr Change Units to kg (g)

AGcr Change Units to N

AHcr Change Units to lb (oz)

BAcr Data output request (single reading)

BBcr Data output request (10/sec)

BB1cr Data output request (20/sec)

BB2cr Data output request (50/sec)

BB3cr Data output request (100/sec)

BDcr Units confirmation request

BEcr Peak data output request

BFcr Minus peak data output request

cr (carriage return)

Pin Description

1 0...1 VDC (analog out)

2 Serial : TXD (RS-232C)

3 Serial : RXD (RS-232C)

5 Serial : CD (RS-232C)

9 Analog: Gnd (analog out)

1 2 3 4 5 6 7 8 9 10 11

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