A&D FX-120i/FX-200i/FX-300i/FX1200i/FX2000i/FX3000i instruction manual RS-232C Serial Interface

13.RS-232C SERIAL INTERFACE

The balance is a Data Communication Equipment (DCE) device. Connect the balance to a personal computer (DTE) using a straight through cable.

Transmission system :

EIA RS-232C (D-Sub 9-pin, female connector)

Transmission form

:

Asynchronous, bi-directional, half duplex

Transmission rate

:

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

Data format

: Baud rate

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

Data bits

: 7 or 8 bits

Parity

:

Even, Odd

(Data bits 7 bits)

None

(Data bits 8 bits)

Stop bit

:

1 bit

Code

: ASCII

RS-232C

1

-5V to -15V

LSB

MSB

0

1

2

3

4

5

6

0

+5V to +15V

Data bits

Stop bit

Start bit

Parity bit

D-Sub 9-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	TXD
	RTS	7	RTS
	CTS	8	CTS
Approx.5V	DSR	6	DSR
	SG	5	SG
			Terminals sample
Inside of balance

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