![Fluke E1M Скачать руководство пользователя страница 60](http://html1.mh-extra.com/html/fluke/e1m/e1m_user-manual_2309862060.webp)
Endurance
®
Series
Users Manual, Rev. 2.0, Jun 2020
60
7 RS485
The RS485 serial interface is used for networked sensors or for long distances up to 1200 m (4000 ft). This allows
ample distance from the harsh environment where the sensing system is mounted to a control room or pulpit where
the computer is located.
To connect the RS485 interface to a standard computer you should use a dedicated converter, see section
12.1.8
, page 93. The RS485 interface allows communication either via the standard
Software or directly via dedicated ASCII commands, see section 14
7.1 Specification
Technical Data:
Physical layer:
RS485, 2-wire, half-duplex, electrically isolated
Baud rate:
1200, 2400, 9600, 19200, 38400 (default), 57600, 115200 Bit/s
Settings:
8 data bits, 1 stop bit, no parity, no flow control
Address range:
1 to 32
0 for stand-alone unit or broadcast transmission
7.2 Installation
Note
A simultaneous communication via USB and fieldbus (e.g., RS485) is not allowed!
Note
Each slave in the network must have a unique nonzero address and must run at the same baud rate!
The recommended way to add more instruments into a network is connecting each instrument in series to the next
in a linear topology (daisy chain). Use only one power supply for all instruments in the network to avoid ground
loops!
Note
It is strongly recommended to use shielded and pair twisted cables (e.g. CAT.5)!
Figure 7-1: Network in Linear Topology (daisy chain)
For implementing the termination, you must activate the sensor internal shunt resistor for the physically last unit in
the network. The activation can be done via the control panel of the sensor.
Master
Slave 1
Last
Slave
Slave 2
Termination <on>
Содержание E1M
Страница 113: ...Accessories Mechanical Accessories 113 12...