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CR510 OVERVIEW
OV1.2 EXCITATION OUTPUTS
The terminals labeled E1, and E2 are precision,
switched excitation outputs used to supply
programmable excitation voltages for resistive
bridge measurements. DC or AC excitation
voltages between -2500 mV and +2500 mV are
user programmable (Section 9).
OV1.3 PULSE INPUTS
The terminals labeled P1, P2, and P3 are the
pulse counter inputs for the CR510. P1 and P2
are programmable for high frequency pulse, low
level AC, or switch closure (Section 9,
Instruction 3). C2/P3 can be configured to
count switch closures up to 40 Hz.
OV1.4 DIGITAL I/O PORTS
Terminal C1 is a digital Input/Output port. On
power-up it is configured as an input port,
commonly used for reading the status of an
external signal. High and low conditions are:
3V < high < 5.5V; -0.5V < low < 0.8V.
Configured as output the port allows on/off
control of external devices. A port can be set
high (5V ± 0.1V), set low (<0.1V), toggled or
pulsed (Sections 3, 8.3, and 12).
Port C2/P3 can be configured as pulse counters
for switch closures (Section 9, Instruction 3) or
used to trigger subroutine execution (Section
1.1.2), or serial SDI-12 communication.
OV1.5 ANALOG GROUND (AG)
The AG terminals are analog grounds, used as
the reference for single-ended measurements
and excitation return.
OV1.6 12V, POWER GROUND (G), AND EARTH
TERMINALS
The 12V and power ground (G) terminals are
used to supply 12V DC power to the datalogger.
The extra 12V and G terminals can be used to
connect other devices requiring 12V power.
The G terminals are also used to tie cable
shields to ground, and to provide a ground
reference for pulse counters and binary inputs.
The G terminals are directly connected to the
Earth terminal. For protection against transient
voltage spikes, Earth Ground should be
connected to a good earth ground (Section
14.7.1).
OV-2
OV1.7 5V OUTPUT
The 5V (±0.2%) output is commonly used to
power peripherals such as the QD1 Incremental
Encoder Interface and AVW1 Vibrating Wire
Interface.
The 5V output is common with pin 1 on the 9
pin serial connector; 200 mA is the maximum
combined current output.
OV1.8 SERIAL I/O
The 9 pin serial I/O port contains lines for serial
communication between the CR510 and external
devices such as computers, printers, Storage
Modules, etc. This port does NOT have the
same configuration as the 9 pin serial ports
currently used on many personal computers.
It has a 5VDC power line which is used to power
peripherals such as the Storage Modules. The
same 5VDC supply is used for the 5V output on
the terminal strip. It also has a continuous 12 V
power supply on pin 8 for external
communication devices such as the COM200
and COM300. Section 6 contains technical
details on serial communication.
OV1.9 CONNECTING POWER TO THE CR510
The CR510 can be powered by any 12VDC
source. The green power connector is a plug in
connector that allows the power supply to be
easily disconnected without unscrewing the
terminals. The Terminal Strip power connection
is reverse polarity protected. See Section 14 for
details on power supply connections.
CAUTION: The metal surfaces of the
CR510 Terminal Strip, and CR10KD
Keyboard Display are at the same potential
as power ground. To avoid shorting 12
volts to ground, connect the 12 volt lead
first, then connect the ground lead.
When primary power falls below 9.6 VDC, the
CR510 stops executing its programs. The Low
Voltage Counter ( B window 9) is incremented
by one each time the primary power falls below
9.6 VDC and E10 is displayed on the CR10KD.
A double dash (--) in the 9th window of the B
mode indicates that the CR510 is currently in a
low primary power mode. (Section 1.6)
The datalogger program and stored data remain
in memory, and the clock continues to keep
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