ROTRONIC HygroLab - Manual (Page 8)

IN-E-HyLab-V4_11
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
Instruction Manual
Document Type
HygroLab bench top indicator version 4:
instruction manual
Document title
Page 8 of 51
© 2006; Rotronic AG IN-E-HyLab-V4_11
1) PC with HW4 (version 1.2.2 or higher):
Parity :
none
Data bits : 8
Stop bits : 1
2) PC with a third-party software using the same ASCII commands as HW3 to request data (see
ASCII communications protocol).
Parity :
even
Data bits : 7
Stop bits : 1
RS-485 interface
This interface is used to connect together a number of HygroLab indicators (as well as other
ROTRONIC devices) so as to form a RS-485 multi-drop. This is useful when the number of PC
ports is limited and provides savings on cabling costs. The RS-485 interface has the same
functionality as the RS-232 interface (measurement data, adjustment of HygroClip probes and
device configuration).
In a RS-485 multi-drop, the master is automatically the device that is connected to a COM port,
USB port or network port (Ethernet) of the PC. Any ROTRONIC device that is equipped with both a
RS-232, USB or Ethernet interface and a RS-485 interface can be used as the master. The other
devices in the RS-485 multi-drop are slaves. Any HygroLab 2 or HygroLab 3 indicator can be used
either as a slave or a master, without special configuration other than giving a unique RS-485
address to each device and setting each device to use the same Baud rate.