INFICON Sensistor Sentrac Hydrogen Leak Detector - Manual (Page 69)

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16.1.2 USB Port
16.1.3 Communication Port
Connector: USB cable
Purpose: For connecting the Sensistor Sentrac with a PC.
Cable: USB 2.0 type Mini-B plug (male) - USB standard type A (male)
Connector: 25 pin female D-sub
Pin Signal Specification Function
1 RS232: Shield See note 1) Serial communication
2 RS232: TxD (DTE transmit data) See note 1) Serial communication
3 RS232: RxD (DTE receive data) See note 1) Serial communication
4 RS232: RTS
(Request to send, issued by DTE) See note 1) Serial communication
5 RS232: CTS
(Clear to send, issued by DCE) See note 1) Serial communication
6 RS232: DCE ready See note 1) Serial communication
7 RS232: Signal GND See note 1) Serial communication
8 RS232: CD
(Carrier detect, issued by DCE) See note 1) Serial communication
9 24V Max 2A 2) Power supply for I/O
10 GND GND for I/O