Digi HygroClip DI digital interface - Manual (Page 19)

IN-E-HyClip DI-V1_10
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
Instruction Manual
Document Type
HygroClip DI digital interface: instruction
manual
Document title
Page 19 of 24
© 2007; Rotronic AG IN-E-HyClip DI-V1_10.doc
for RS-485 slaves” is being used, HW4 automatically changes from 00 to 01 the RS-485 address
of any master that has slaves attached. As a result, all masters end up with the same RS-485
network address (01). In addition, HW4 automatically changes the RS-485 address of the slaves
in each multi-drop from 00 (factory default) to a unique address ranging from 02 to 64. The same
address range (02 to 64) is used again when there is more than one multi-drop RS485 network.
Notes:
- We recommend using HW4 to give each HygroClip DI a unique name for easier identification.
- In the situation where an RS-485 network is to be monitored by software other than HW4,
you will have to use HW4 to give each device a unique RS-485 address prior to connecting to
the network.
Example: HygroClip DI with USB port
The number of HygroClip DI with USB port that can be directly connected to a PC depends on the
number of USB ports available on the PC.
PC (HW4)
USB port Master
Address 1 Address 2 Address 64
DI
USB
RS485 RS485 RS485
Slave
Slave
Multi-drop: up to 1000m (3300 ft)
RS485: 2 wires
IMPORTANT:
- If you change an instrument from master to slave, be sure to change the RS address of the
instrument to 00 before establishing the RS-485 connection. Not doing so may prevent HW4
from detecting the instrument. After detecting the instrument, HW4 will automatically change
the RS address to 02 or higher. Please note that HW4 may eventually change the address of
any master with address 00.
- All devices within a multi-drop should use the same Baud rate. See Baud rate compatibility
requirements.
- HygroClip DI-4 and DI-4-WL: please note that the Baud rate of the HygroClip DI and the
Baud rate of the internal Ethernet module should be set to the same value
- The RS485 wiring can be done with a twisted pair (2-wire, telephone type) and wall mounted
RJ45 receptacles. No shielded cable and no terminator should be required. Be sure to
observe the polarity for each connection. Using 4-wire cable, offers the option of powering all
devices in the multi-drop from a single DC voltage source.