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Auto/Manual Mode Register (MMR) ID: U
This register sets the controlling mode for the outputs. In Auto Mode (0) the
meter controls the setpoint and analog output. In Manual Mode (1) the outputs
are defined by the registers SOR and AOR. When transferring from auto mode
to manual mode, the meter holds the last output value (until the register is
changed by a write). Each output may be independently changed to auto or
manual. In a write command string (VU), any character besides 0 or 1 in a field
will not change the corresponding output mode.
U abcde
e = Analog Output
d = SP4
c = SP3
b = SP2
a = SP1
Writing to this register (VW) while the analog output is in the Manual Mode
causes the output signal level to update immediately to the value sent. While in
the Automatic Mode, this register may be written to, but it has no effect until the
analog output is placed in the manual mode. When in the Automatic Mode, the
meter controls the analog output signal level. Reading from this register (TW)
will show the present value of the analog output signal.
Example : VW2047 will result in an output of 10.000 mA, 12.000 mA or
5.000V depending on the range selected.
Setpoint Output Register (SOR) ID: X
This register stores the states of the setpoint outputs. Reading from this
register (TX) will show the present state of all the setpoint outputs. A “0” in the
setpoint location means the output is off and a “1” means the output is on.
Example : VU00011 places SP4 and Analog in manual.
X abcd
d = SP4
*Due to the absolute
accuracy rating and
signal may differ 0.15% FS
Analog Output Register (AOR) ID: W
This register stores the present signal value of the analog output. The range
of values of this register is 0 to 4095, which corresponds to the analog output
range per the following chart:
Output Signal*
Register Value
0-20 mA 4-20 mA 0-10V
resolution of the output
0 0.000 4.000 0.000
card, the actual output
1 0.005 4.004 0.0025
c = SP3
b = SP2
a = SP1
In Automatic Mode, the meter controls the setpoint output state. In Manual
Mode, writing to this register (VX) will change the output state. Sending any
character besides 0 or 1 in a field or if the corresponding output was not first in
manual mode, the corresponding output value will not change. (It is not
necessary to send least significant 0s.)
Example : VX10 will result in output 1 on and output 2 off.
2047
4094
4095
10.000
19.995
20.000
12.000
19.996
20.000
5.000
9.9975
10.000
from the table values. The
output signal corresponds
to the range selected (0-20
mA, 4-20 mA or 0-10 V).
COUNTER C SLAVE COMMUNICATIONS
Counter C may be programmed for ????? , to act as a serial slave display. By doing this, the carriage return <CR>
is added as a valid command terminator character for all serial command strings. The <CR> as a terminator may be
very useful for standard serial commands, even if Counter C is never displayed or sent a slave message. The $
terminator should not be used in the slave mode. If numeric values are not to be saved to EPROM then send the value
as a literal transmission with <CR> terminator.
The Counter C slave display is right aligned. It has a capacity of displaying six characters. When less than six
characters are received, blank spaces will be placed in front of the characters. If more than six characters are sent,
then only the last six are displayed. The meter has a 192 character buffer for the slave display. If more than 192
characters are sent, the additional characters are discarded until a terminator is received. Counter C processes
numeric and literal transmissions differently.
Numeric Transmissions
When a string that does not begin with #, T, V, P or R is received, the meter
processes it as a Numeric transmission. In this case, only the recognized numbers
and punctuation are displayed. All other characters in the string are discarded. If
a negative sign appears anywhere in the string the resulting number will be
negative. Only the most significant decimal point is retained. If no numerical
characters are received, then the numeric value will be zero. The numeric display
can be used for setpoint (boundary action only) and analog output functions.
When using this display for setpoint and analog output values, the decimal point
position must match the programming entered through the front panel. The
numeric value is retained in Counter C memory until another Numeric
transmission is received.
Recognized Numbers = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Recognized Punctuation = period, comma, minus
26
Literal Transmissions
When a string that begins with # is received, the meter processes it as a Literal
transmission. In this case, any unrecognized characters will be replaced with a
space. A Literal display will replace a Numeric value in the Counter C display.
However, it will not remove a previous Numeric value from Counter C memory
or prevent the Counter C outputs from functioning with the Numeric value.
Literal transmissions are only possible when using RS232 or RS485 cards.
Recognized Characters = a, b, c, d, e, f, g, h, i, j, l, n, o, p, q, r, s, t, u,
y, z (in upper or lower case)
Recognized Numbers = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Recognized Punctuation = period, comma, minus, blank
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