User guide

Remote Operation Model 6200T Total Sulfur Analyzer
Teledyne Analytical Instruments 178
Table 8-1: Status Output Pin Assignments
CONNECTOR PIN STATUS CONDITION (ON=CONDUCTING)
1
System Ok ON if no faults are present.
2
Conc Valid ON if concentration measurement is valid, OFF when invalid.
3
High Range ON if unit is in high range of any AUTO range mode.
4
Zero Cal ON whenever the instrument is in ZERO calibration mode.
5
Span Cal ON whenever the instrument is in SPAN calibration mode.
6
Diag Mode ON whenever the instrument is in DIAGNOSTIC mode.
7-8
Unused
D
Emitter Bus
The emitters of the transistors on pins 1-8 are bussed together. For most
applications, this pin should be connected to the circuit ground of the
receiving device.
+
Dc Power + 5 VDC source, 30 mA maximum (combined rating with Control Inputs)
Digital Ground The ground from the analyzer’s internal, 5/±15 VDC power supply.
8.1.2. Control Inputs
Control inputs allow the user to remotely initiate ZERO and SPAN calibration modes
are provided through a 10-pin connector labeled CONTROL IN on the analyzer’s rear
panel. These are opto-isolated, digital inputs that are activated when a 5 VDC signal
from the “U” pin is connected to the respective input pin.
Table 8-2: Control Input Pin Assignments
INPUT STATUS CONDITION WHEN ENABLED
A External Zero Cal
Zero calibration mode is activated. The mode field of the display will read
ZERO CAL R.
B External Span Cal
Span calibration mode is activated. The mode field of the display will read
SPAN CAL R.
C Unused
D Unused
E Unused
F Unused
Digital Ground Provided to ground an external device (e.g., recorder).
U
DC Power For Input
Pull Ups
Input for +5 VDC required to activate inputs A - F. This voltage can be taken
from an external source or from the “+” pin.
+ Internal +5v Supply
Internal source of +5V which can be used to activate inputs when connected
to pin U.
There are two methods to activate control inputs. The internal +5V available from the
“+” pin is the most convenient method (Figure 8-2). However, to ensure that these
inputs are truly isolated, a separate, external 5 VDC power supply should be used
(Figure 8-3).