6.1.2 Contact assignment RS 485
An RS 485 connection cannot be implemented using a 3-wire cable; con-
tacts should not be connected unless they are needed. The following contact
assignment applies, depending on the version of the D-Sub socket on the
connected system:
Table 3: D-Sub socket, RS 485, 9-pin
Signal
Contact
Data A (-)
1
GND (optional)
5
Data B (+)
6
A RS 485 bus always requires a bus termination in the form of a
termination network (see Figure) that guarantees a defined standby
state in the high-ohm phases of bus operation. This termination
network is usually integrated in the insertable PC card (RS 485).
6.2 Software update
Older software installed on constant temperature equipment may have to be
updated for the new interface to work.
1.
Switch on the constant temperature equipment after installing the
new interface.
2.
Check whether a software warning appears on the display:
Warning
SW too old
: Please contact LAUDA Service, see
Chapter 1.6 “Contact LAUDA” on page 6.
No software warning: Operate the constant temperature equip-
ment as normal.
Fig. 8: RS 485 termination
V1
Interface module LRZ 913
16 / 39