Salter Brecknell SBI-505 - Manual (Page 5)

3
Communication interface
RS232 : DB9 Pin
DB9 definition
5 4 3 2 1
9 8 7 6
Pin function and definition as bellows:
DB9 joint Definition Function
2 TXD Sending data
3 RXD Receiving data
5 GND Ground interface
Note: if RS485, The connection pin is 2 and 5 pin.
Basic operation
Power on & off
Press 2 seconds to power on or off the indicator. After self test
it will go to the weighing mode.
Zero operation
1. Initial zero setting
During power up if the weight on the scale is within the initial zero
tolerance, indicator show zero automatically.
2. Manually Zero setting
When the scale is stable and not the negative weight you can zero the
weight within tolerance by press key.