Hach ANATEL PAT700 - 2.8 RS-232 commands

Page 24 Installation – PAT700 Total Organic Carbon Analyzer
Operator Manual Anatel
WGM - 28 November 2007 - Edition 01
Discrete outputs
The analyzer has four discrete outputs, as listed in Table 2-9 and Table 2-10.
• Discrete output 1 is a TOC alarm. The output reports the TOC level as above (low
state) or below (high state) the user-specified alarm limit.
• Discrete output 2 is an uncompensated conductivity alarm. A low state indicates the
conductivity level is above the alarm limit. A high state indicates the conductivity level
is below the alarm limit.
• Discrete output 3 reports a warning or failure condition. A low state indicates an error
condition exists. A high state indicates no error conditions exist.
• Discrete output 4 reports a TOC analysis start (by indicating the state of the sample
inlet valve). A low state indicates the sample valve is closed. A high state indicates the
sample valve is open.
Table 2-9 Discrete outputs 1 and 2 wiring terminal designations
Wiring connector Terminal Description Variable Designation
1 Digital output 1 (+) TOC alarm DO1+
2 Digital output 2 (+) Uncompensated
conductivity alarm
DO2+
3 Common return for discrete outputs 1 and 2 (–) TOC alarm,
uncompensated
conductivity alarm
DO1/2–
4 • 12 VDC power supply +
• Connect only if input device requires power supply
Input power supply +12V
5 • 12 VDC power supply –
• Connect only if input device requires power supply
Input power supply GND
Table 2-10 Discrete outputs 3 and 4 wiring terminal designations
Wiring connector Terminal Description Variable Designation
1 Digital output 3 (+) Warning or failure DO3+
2 Digital output 4 (+) TOC analysis start DO4+
3 Common return for discrete outputs 3 and 4 (–) Warning or failure,
TOC analysis start
DO3/4–
4 • 12 VDC power supply +
• Connect only if input device requires power supply
Input power supply +12V
5 • 12 VDC power supply –
• Connect only if input device requires power supply
Input power supply GND