Salter Brecknell SBI100 - Manual (Page 24)

22 SBI 100 User Instructions Manual
4.4.3 RS-232 Serial Interface Wiring
DE-9 Female Scale DE-9 Male Host
Pin Name Direction Pin Name Direction
2. TXD Out 2. RXD In
3. RXD In 3. TXD Out
5. SG - 5. Ground -
Pins 1, 4, 6, 7, 8, 9 not used