03/03 7 - 16 DS 2.501A
MIU SWITCH OPTIONS WHEN IN MODEM MODE
MIU3252 COMMISSIONING (Modem Interface Mode)
1. Disconnect the power supply.
2. Remove gland plate and using a 25 way ribbon cable connect the
MIU to a modem.
3. Select mode of operation from bit switches seven and eight.
Bit switch 7 OFF.
Bit switch 8 ON (modem operation).
4. Select modem type using bit switch 1.
ON - Disable modem initialisation.
OFF - Enable modem initialisation, Hayes command set
initialisation string sent to the modem is "ATV0E1M0S0=1Q0".
If ON is selected the modem must be manually configured before
connection to the MIU.
5. Bit switches 2 to 5 can be in any position and are ignored.
6. Select the communication speed for both the modem (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.
7. Switch bit switch 6 to the ON position. This will ensure that all
variables in memory are reset to default values. Switch on the
power.
8. The MIU checks the bit switch settings and if the modem is to be
initialised the MODEM LED on the MIU will flash at five times per
second whilst the modem is being initialised. Once initialisation is
complete the MODEM LED will stay ON and the RUN LED will be
constantly ON.
9. If the start up sequence does not follow the description in
instruction 8 then turn the power off and check that the MIU and
controllers have been correctly wired, that there are no short
circuits in the communication wiring and that the 25 way
connection lead is correctly connected. 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.
10. Set bit switch 6 to OFF so that if there is a power failure the MIU
will not be reset.
11. The MIU is now ready to accept data via the modem. By default the
address of the MIU in modem mode will be 0, this cannot be
changed.
12. At this stage the autodial telephone numbers, site mnemonic and
new poll data may be programmed into the MIU memory. This is
achieved by calling up the MIU using the auto answer facility from
the Satchnet PC and selecting the MIU.
13. The MIU is now fully operational.
MIU/MODEM
If bad communications are experienced it may be necessary to utilise
‘low loss’ telephone lines as supplied by the telephone company on
certain applications.
MIU 3252 USED ON A WAN
SW1
SWITCH
(Increment
No.)
POSITION
On
(open)
Off
1
2
3
4
5
6
Not Hayes Modem
-
-
-
-
Reset
Hayes Modem
-
-
-
-
No Reset
7 - Set to OFF
8 Set to ON -
Standard 25 Way
RS232 Cable
SATCHNET TERMINAL
(DS 2.501)
EXTERNAL
MODEM
(DS 2.501)
PUBLIC
SWITCHED
TELEPHONE
NETWORK
(PSTN)
MODEM
(DS 2.501)
To other Networking
controllers e.g. MMC,
CSMC, IAC600, 400
Fig.8
Standard 25 Way
RS232 Cable
15m Max
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