GREISINGER GRS 485 ISO Operating Manual

1 Scope of supply

•
GRS 485 ISO converter
•
2-pole screw type/plug in connector for RS485 connection
• 9-pole serial interface cable (RS232)
•
operating manual

2 General information

The GRS 485 ISO is a bi-directional interface converter RS232 <-> RS485, for the connection of up to 16
GIA or GIR to the serial interface of your PC.
The converter switches automatically from transmisson to reception mode. The switch back time between
transmission and reception mode can be chosen by means of a switch.
The interfaces are optically isolated. Echo can be suppressed if necessary by switch setting.
220...240V
50/60Hz
GRS 485 ISO
RS232 - RS485
Converter
RS485-
RS232-
Interface
Interface
+ -
1
A B
9

3 Installation and commissioning

• Connect the GIR/GIA (max. 16 devices) to GRS 485 ISO
according to the wiring diagram via a 2-pin connection
cable (twisted line recommended).
• Then connect the GRS 485 ISO to the RS232-interface
of your personal computer.
• Connect GRS 485 ISO to a supply voltage of 230VAC.
In case your PC is not equipped with a 9-pin Dsub-connector or in case it has already been assigned,
the GRS 485 ISO can also be connected to a 25-pin Dsub-connector via any commercial adapter (e.g.
GSA9S-25B).
If the interface converter GRS 485 ISO is not handled properly, the converter itself or the devices
connected may be subject to damage. In such a case we do not assume any warranty claims! The
manufacturer shall not be liable for any damage to other connected devices caused by the use of the
GRS 485 ISO.
GREISINGER
D - 93128 Regenstauf, Hans-Sachs-Straße 26
Fon: +49 9402 / 9383-0
Operating Manual
GRS 485 ISO
RS232 – RS485 Converter
The settings are made by means of DIP-switches at the side of the housing:
Switch 1: echo suppression
off (switch up):
on (switch down):
Switch 2: switch back time for fast data transfer
off (switch up):
on (switch down):
Fax.: +49 9402 / 9383-33
Standard operation with echo.
The echo will be suppressed.
Standard operation with switch back time of ~10 ms.
Switch back time of ~2 ms.
Only at baud-rates >9600.
This is only necessary for short response times
(3..10 ms).
RS232
electronic GmbH
eMail: info@greisinger.de
S30.0.01.6C-03
GRS485ISO
A A
B
B
A
B
GIA 10
GIA 10