DayTronic 3500 Series, Instruction Manual

Page: 17 / 122

You can use the three logic control outputs to actuate solenoid valves, illuminate
panel displays, sound alarms, start and stop motors or pumps, initiate and control
safety shut-down sequences, and perform many other automation tasks that
require "intelligent" switching, even of substantial amounts of power.
In addition to the standard logic inputs and outputs provided by the LOGIC I/O
CONNECTOR, the
Model 3570 DC Strain Gage Conditioner (ONLY) also
accepts two negative-true logic inputs at its rear-panel ANALOG INPUT CONNEC-
TOR. These two inputs, shown in Fig. 5(b), let the operator directly control the
SHUNT CALIBRATION process, which is explained in detail in Section 4. Again,
see Appendix F for a full description of these logic functions.
1.g
M
NEMONIC
C
OMMANDS
There are two ways to issue commands to a 3500 Series instrument. One way is
through the front-panel push buttons. These buttons allow you
• to enter all necessary SETUP COMMANDS , as explained in Sections 3.a and
4.a*; and also
• to enter RUN-TIME COMMANDS for control of positive peak capture, appli-
cation of tare offset, and initiation and halting of hard-copy transmissions (see
Sections 5.b, 5.c, and 5.d).
The second way to issue commands to the instrument is via the RS-232/485
Computer/Network Communications Interface. When set to the RS-232 (SINGLE-
NODE) mode, this interface will accept commands from a connected computer,
terminal, or other RS-232-C device. When the unit is used in the RS-485 (MULTIN-
ODE) mode, commands will normally originate from an application program in the
network's supervisory computer.
In either RS-232 or RS-485 mode, commands to the instrument must be transmit-
ted in a standard ASCII Command Syntax. This syntax uses simple three-letter
1.9
I
NTRODUCTION
1
ANALOG INPUT CONNECTOR
–
SHLD
SHUNT CAL
CONTROL
COM
SIG
+
–
SIG COM
PWR
*
Ground
connections to
be provided by
user. See also
Fig. 17(a). *
LOGIC LOW
TO ENABLE
Logic Inputs:
+ CALIBRATE
– CALIBRATE
Fig. 5(b)
Shunt-Control Logic
Inputs for the Model
3570 DC Strain Gage
Conditioner (ONLY)
* As explained in Section 3.a.2, if a nonzero SECURITY CODE has been specified, the operator will
have to enter that code before any SETUP COMMANDS can be applied via the front-panel but-
tons.
1.g M
NEMONIC
C
OMMANDS