15.Standard Input and Output Interface

15.1.RS-232C Interface

The balance is a DCE device. Connect the balance to a personal computer (DTE) using a

straight through cable.

 

 

 

 

 

 

 

 

 

 

 

Transmission system

: EIA RS-232C

 

 

 

Transmission form

: Asynchronous, bi-directional, half duplex

Transmission rate

: 10 times/second or 5 times/second (same as data refresh rate)

Data format

: Baud rate

: 600, 1200, 2400, 4800, 9600, 19200bps

 

Data bits

: 7 or 8 bits

 

 

 

 

Parity

: Even, Odd

(Data bits 7 bits)

 

 

 

 

 

None

(Data bits 8 bits)

 

Stop bit

: 1 bit

 

 

RS-232C

 

Code

: ASCII

 

 

 

 

 

 

 

 

 

 

 

 

 

-5V to -15V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+5V to +15V

 

 

 

 

 

 

 

 

 

 

 

Data bits Start bit

Stop bit Parity bit

D-Sub 25 pin assignments

Pin No.

Signal name

Direction

Description

1

-

-

No connection

2

TXD

Output

Transmit data

3

RXD

Input

Receive data

4

-

-

No connection

5

SG

-

Signal ground

6

DSR

Output

Data set ready

7

RTS

Input

Request to send

8

CTS

Output

Clear to send

9

-

-

No connection

Signal names of the balance side are the same as the DTE side with TXD and RXD reversed.

#4-40UNC

Balance side

 

 

Computer side

DCE

 

 

DTE

 

TXD

2

RXD

 

RXD

3

+5V

TXD

RTS

7

 

RTS

Ω

CTS

8

 

3.3k

 

 

CTS

 

DSR

6

 

DSR

 

SG

5

 

SG

 

 

 

Inside of balance

 

Terminal example

 

 

 

61

Page 63
Image 63
A&D GH-120/GH-200/GH-300/GH-202/GH-252 Standard Input and Output Interface, RS-232C Interface, Sub 25 pin assignments