IN-E-HyFlex-V4_10
Rotronic AG
Bassersdorf, Switzerland
Document code
Unit
Instruction Manual
Document Type
HygroFlex transmitter version 4: instruction
manual
Document title
Page
32
of 61
© 2006; Rotronic AG IN-E-HyFlex-V2_10.doc
Example: RS-232 / RS-485 Network
Unit 64
Unit 3
Unit 2
Unit 1
2 wires
RJ45
2-cable
connector
RS232 (3 wires)
maximum 150 m (490 ft)
COM
PC
RS485 (2 wires)
maximum 1,000 m (3,300 ft)
The RS232 connection between the HygroFlex and a PC requires 3 wires: RX, TX and GND.
Without a signal booster, the maximum cable length is limited to 150 m (490 ft). The RS485
connection requires two wires and should not exceed a total of 1,000m / 3,300 ft.
Each HygroFlex 2 or 3 is supplied with a special 5-pin connector that accommodates two cables
(see Connector Diagrams). On the first unit of a serial network, both the RS232 and RS485 wiring
share this connector. Be sure to observe the polarity for each connection. Wall mounted RJ45
receptacles are a convenient means of connecting additional units to the RS-485 cable.
7
HygroFlex function menu
The functions of the HygroFlex can be accessed either with the optional display and keypad or by
connecting a HygroPalm indicator to the Test connector of the HygroFlex
1
(see Remote Mode).
Some functions, including all calibration functions, can also be accessed with the HW4 software.
1
The HygroFlex 3 with the Ethernet interface option does not have a Test connector
To access the function menu from the HygroFlex keypad, press the MENU key. The first menu item
appears on the message line of the LC display. Use the UP or the DOWN key to navigate the
menu. When the desired menu item appears on the message line of the LC display, press the
ENTER key to select. Some menu items have sub-items. These can be selected with the UP,
DOWN and ENTER keys. To exit the menu and return to the normal display mode, press the
MENU key. The instrument also returns automatically to the normal display mode when no key is
being pressed for some time (main menu: 10 sec., submenu: 30 sec.).
