SERVOPRO NOx Analyzers Page
19 User-Defined NO Relay 11 Digital Output Uses Relay RTN 3
20 User-Defined NO Relay 12 Digital Output Uses Relay RTN 3
21 User-Defined NO Relay 13 Digital Output Uses Relay RTN 4
22 Reserved Reserved Reserved
23 Set Wet Mode / O2 Cal Digital Input Hold to Ground in Remote
24 NO/NOx/NO2 Mode Digital Input Hold to Ground in Remote
25 Set NO Mode Digital Input Hold to Ground in Remote
26 Set Remote Digital Input Hold to Ground
27 User-Defined NO Relay 14 Digital Output Uses Relay RTN 4
28 User-Defined NO Relay 15 Digital Output Uses Relay RTN 4
SERIAL INTERFACE
The serial interface enables remote control of the analyzer by a master computer. It is
implemented as an RS232 V24 interface and meets all requirements of the AK protocol.
A 9-pin male connector at the back of the unit is used to connect a master computer with the
following pin assignment:
Figure 0-1 Serial Interface
Pin 3 = Txd (transmit)
Pin 2 = Rxd (receive)
Pin 5 = Gnd (ground)
INTERFACE SPECIFICATIONS
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