User manual

DS 2.501A 6 - 16 03/03
BASIC DIAGRAM FOR MIU 3252
MIU 3252 RS485 REPEATER MODE
MIU 3252 COMMISSIONING (Repeater Mode)
1. Disconnect power supply.
2. Select mode of operation using bit switch eight.
i. OFF for repeater.
3. Select the communication speed for both the PC LAN and LAN by
using the jumpers (LK 6 and LK 5 respectively). The
communication speeds are marked on the PCB. It is possible to
set the LAN communication speed from a computer running
Satchnet Networking Software version 6.3 or later, if this is
required jumper LK 5 should be removed.
4. Set bit switch 7 to ON if the MIU is to operate as a transparent
(Dumb) repeater.
Set bit switch 7 to OFF if the MIU is to act as an addressable
repeater.
5. If bit switch 7 is set to ON then bit switches 1 to 6 are ignored and
can be left in any position.
If bit switch 7 is set to OFF then bit switches 1 to 6 are used to set
the MIU address (see table).
6. Switch on the power.
7. The RUN, MODEM and DUMB LEDs should light simultaneously.
The MODEM LED will then go OFF. If bit switch 7 is set to ON
then the DUMB LED will also stay ON.
MIU SWITCH OPTIONS WHEN IN REPEATER MODE
8. If the start up sequence does not follow the description in
instruction 7 then turn the power off and check that the MIU and
controllers have been correctly wired and that there are no short
circuits in the communication wiring. Switch on the power and
check the MIU start up sequence again. If no obvious fault is
found and the MIU still fails to start correctly then the MIU should
be replaced.
9. The MIU is now fully operational.
RS232 25
Way D Type
Connector
RS485
Serial Link
LAN
RS485
Serial Link
PC LAN
Fig.6
RS485/422
Converter
Mode
Computer
The MIU may be used on a
main LAN or a sub-LAN.
Fig.7
To fu rt he r
controllers on
the LAN e.g.
MMC, CSMC,
IAC 600/400
Maximum 1000m
SWITCH
(Increment
No.)
POSITION
On
(open)
Off
1
2
3
4
5
6
1
2
4
8
16
32
0
0
0
0
0
0
7Dumb
Repeater
Addressable
Repeater
8 - Set to OFF
Address Setting only
used if bit switch 7 is
OFF