ROTRONIC HC2 - Manual (Page 14)

E-M-HC2-accessories_24
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
Accessories and Parts
for probes, indicators and transmitters Instruction Manual
Document Type
Page 14 of 23
Document title
© 2009-2010; Rotronic AG E-M-HC2-accessories_23
7.1.2 RS-485 network design and installation
Please follow the instructions provided in document E-DV04-RS485.01
o
Limit the RS-485 network to a single main data line (one segment)
o Terminate each end of the main data line with a 240 Ohm resistor. Termination resistors should be placed
only at the extreme ends of the data line, and no more than two terminations should be placed in any
single segment of an RS-485 network
o The total length the T connections should be included in the limit set for the main data line
(100 m or 1000 m)
o Do not connect more than 64 devices to the same main data line
o Each device connected to the RS-485 network should be given a unique address (1 to 64)
7.2 Ethernet / RS-485 converter
Use with:
o Any AirChip 3000 device that has a RS-485 port
o Docking stations for the HygroLog HL-NT
o Any legacy device that has a RS-485 port
IMPORTANT:
1) Use of the AC3011 requires a PC with the HW4 software version 2.4.0 or higher. The HW4 software
includes an Ethernet Configuration Tool that can be used to make the TCP/IP settings of the AC3011
converter compatible with the LAN to which the HW4 PC is connected For additional information see
documents E-M-HW4v3-Main (§ 7.4 and § 11.2) and IN-E-TCPIP-Conf.
2) The AC3011 converter allows mixing both AirChip 3000 and legacy devices within the same RS-485
network as long as all devices use the same Baud rate (19200)
Order Code Description
AC3011
Allows connecting up to 64 RS-485 slave
devices to an Ethernet port (PC or LAN).
The AC3011 has an IP address but no RS-
485 address and does not count as one of the
devices on the RS-485 network.
The AC3011 converter requires a 12 to 24
VDC external power supply.