7
sets the alarm flag, connected with the corresponding binary input respectively as
BiIn0->1
or
BiIn1->0.
These flags may be used in rules processing.
Each of the binary inputs may be independently configured to work in the counter input
mode. The use of binary inputs in this additional mode will be presented further in
respective section of this manual.
4.1.2. Analogue inputs
The
MT-301/304
telemetric modules are equipped respectively in two and one 4-20 mA
analog inputs marked as
A1
and
A2
. These inputs allow for easy, direct connection of
current signal sources. The other two modules are not equipped with analog inputs.
In configuration of analog inputs the user can precisely rescale the input signal using
engineering units. The alarm levels and hysteresis are also configurable. The possibility to
configure as much as four alarm levels guarantees the flexibility of supervision over the
monitoring of the analog signals. Automatically activated alarm flags
AnLoLo
,
AnLo
,
AnHi
,
AnHiHi
may be used in rule processing.
4.1.3. Binary outputs
The
MT-301/303
telemetric modules are equipped with two dedicated binary outputs
each. MT-301 outputs may also work as control lines for external analog inputs
MUX
device if set to appropriate working mode.
4.1.4. Serial port
The
MT-301/302/303/304
telemetric modules are equipped with single RS-232 serial
port. This port is intended exclusively for the local configuration of the telemetry module’s
parameters. The port should be connected to an external PC computer with the
configuration program running. The port settings are fixed (non modifiable) and the length
of the connection cable should not exceed 15 m.
The port is not isolated!
ATTENTION!!!
The first configuration has to be performed locally, via PORT1 in order
to provide the module with basic GPRS communication parameters like
PIN code and APN name.
4.1.5. Real time clock
The
MT-301/302/303/304
module is equipped with
astronomical time clock
(
RTC
).
The clock is a base for defining timers (
TMR1, TMR2)
and time stamps for measurement
results recorded in registers. Imprecise clock setting results in faulty time stamping and
subsequent loss of vital information. For that reason, it is recommended to set the clock to
UTC time instead of the local time zone of the module's placement.
ATTENTION!!!
The module's RTC clock does not automatically adjust to summer/winter
time. To avoid loss of data during manual time adjustment, UTC time is
recommended .