Teledyne 9110T Internal Digital I/O, 13.3.3.7. I2C Data Bus, Only until signal I/O menu is exited

Model 9110T NOx Analyzer Principles of Operation

∙For information on setting up the status outputs (see Section 3.3.1.4).

CONTROL INPUTS: By applying 5V DC power to these digital inputs from an external source such as a PLC or Data logger zero point and span point calibrations can be remotely initiated. .

∙For information on setting up the status inputs (see Section 3.3.1.6).

13.3.3.6. Internal Digital I/O

There are several internal digital control signals that are generated by the motherboard under CPU control and used to control subsystems of the analyzer.

ELECTRICAL TEST CONTROL: When the CPU sets this control signal to high (ON) the electric test feature (ETEST) is initiated (see Section 8.3).

∙The ETEST can be initiated by following the procedure in Section 12.7.12.2, or by setting the SIGNAL I/O Function ELEC_TEST to ON.

OPTICAL TEST (OTEST) CONTROL: When the CPU sets this control signal to high (ON) the optical test feature is initiated (see Section 8.3).

∙The OTEST can be initiated by following the procedure in 12.7.12.1, or by setting the SIGNAL I/O Function OPTIC_TEST to ON.

PMT PREAMPLIFIER RANGE CONTROL: The CPU uses this control switch the instrument between its LOW and HIGH physical ranges (see Section 5.4.1).

∙The instrument can be forced into its HIGH physical range setting the SIGNAL I/O function PREAMP_RANGE_HI to ON.

O3 GEN STATUS: The CPU uses this control signal to turn the O3 generator ON/OFF by setting it to HIGH/LOW respectively. The CPU turns OFF the O3 generator if there is if there is no or low air flow to it as measured by the O3 flow sensor or if the instrument has been turned off for more than 30 minutes.

∙The O3 generator can be manually turned ON/OFF by using the OZONE GENERATOR OVERIDE feature (See Section 12.7.15.1) or by setting the SIGNAL I/O function O3GEN_STATUS to ON or OFF.

Note	Any I/O signals changed while in the signal I/O menu will remain in effect
	ONLY until signal I/O menu is exited.
	The analyzer regains control of these signals upon exit and returns them
	to their normal value/setting.

13.3.3.7. I2C Data Bus

I2C is a two-way, clocked, bi-directional digital serial I/O bus that is used widely in commercial and consumer electronic systems. A transceiver on the Motherboard converts data and control signals from the PC-104 bus to I2C format. The data is then fed to the relay board, optional analog input board and valve driver board circuitry.

Teledyne Analytical Instruments 344