Universal transmitter 8390-1
6. MEASURING OPERATIONS
With measuring instrument ALMEMO
®
8390-1 up to 4 measuring channels, if
these have been programmed, are scanned continuously at a conversion rate
of 2.5 or 10 measuring operations per second; this ensures continuous humidi-
ty variable calculation or temperature compensation for dynamic pressure pro-
bes and chemical probes; (see Manual, Section 6.5.1.3).
Measured values can be output using any of the following methods :
1. Measured value output to an analog output (see Manual, Section 5.1.1)
2. Once-only measured value output via the interface (s. Man., Sec. 6.5.1.1)
3. Cyclic measured value output via the interface (s. Man., Section 6.5.1.2)
6.1 Digital interfaces
For communication with the transmitter there is the V24 interface cable ZA
1909-DK5 (available as accessory) (see Manual, Section 5.2.1); this is also
available, to cope with environments subject to particularly heavy disturbance,
in optic fiber technology (ZA 1909-DKL). This cable is plugged into socket A1
(6). The baud rate is by default 9600 baud; the file format is 8 data bits, 1 stop
bit, no parity (settings cannot be changed).
Sensors can be programmed
and the transmitter can be
completely confi-
gured
via the serial interface; this is best performed using the AMR-Control
configuration software or a terminal (PC) (see Manual, Chapter 6).
RS-485 interface (option I)
Option I provides an integrated RS-485 interface; with this option, in order to
connect the first device to a computer, one needs the RS-422 / RS-485 bus
driver ZA 5099-AS (see Manual, Section 5.3.3.1) or the RS-422 output of a
network distributor. The transmit and receive lines must be crossed once-only.
Up to 32 extra devices can then be easily networked using parallel 4-wire cab-
ling - even over long distances (maximum 1 km); (see Manual, Section 5.3.3).
Over shorter distances (maximum 100 meters) it is also possible to lead the
power supply over the bus using 6-wire cabling. The transmitter is - in each
such case - electrically isolated from the bus.
Ethernet interface (option E)
With the Ethernet interface it is possible to connect the transmitter to an Ether-
net - PC network. It is even possible in this way to link up to the Internet. The
device can be connected, via an RJ-45 (10BASE-T) plug connector (7), direct-
ly to a PC, switch, or hub. Additional LEDs are provided for the purposes of
monitoring the Ethernet connection.
Having an Ethernet transmitter integrated in measured value acquisition is the
default setting in the Win-Control WC3 software package; if this is not the
case, this can be retrofitted with option WCO6. With additional software
AMR2ips SW5500-C22, it is also possible to operate a number of Ethernet
transmitters.
page 14