Innovate Motorsports LM-1 Digital Air/Fuel Ratio (Lambda) Meter - Manual (Page 20)

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Appendix A: LM-1 Cable Pinouts
A1. Serial Interface (Mini-DIN8 female connector)
Serial Interface:
19.2 kBaud
8 Data bits
1 Stop bit
no parity
no hardware handshaking
Pin Assignments
Lambda Meter
Mini-DIN8
Signal Computer DB-9 Computer DB-25
1 n/c
n/c n/c
2 CTS 8 5 Connected to +5V
3 RxD 2 3
4 GND 5 7
5 TxD 3 2
6 GND 5 7
7 n/c n/c n/c
8 n/c n/c n/c
A2. Aux Input Connector (Mini-DIN7 female connector)
Note: Connect to signal of maximum 5V only.
Serious damage to meter and/or sensor may result if connected to signals of more than 5V
amplitude.
Pin Assignments
Lambda Meter
Mini-DIN7
Signal