Technical / Programming Manual
FT128 Rev 2.2
21
3.9 RS232 Interfaces
Two interfaces can be used:
EBLWin (PC program). (9-Way female "D" connector, located on the Main Control
Board 4556)
Web-server II 1598. (3-Way Molex connector)
Connections as per drawing F734.
3.10 RS485 Transceiver (Optional)
An IC socket is provided in FT128 Main Board 4556 where an optional RS485 transceiver
communications chip 4552 can be fitted. This transceiver chip provides an interface (screw
connectors on the external termination board SUB835) for up to 8 Display Units, i.e. AAU
1736 and/or EPU 1728 running in S/W mode xxxx – 1587
. All Display Units must be
connected in series
(daisy-chained) to the RS485 bus and the V
DC
supply on the external
termination board SUB835.
The data rate in this mode is 9600 baud and the RS485 cable length is maximum 1200 m
depending on the cable size. The V
DC
cable must be => 1.5 mm
2
depending on the cable
length, refer to Table 18 page 169 for cable length calculation.
Connections as per drawing F665.
3.11 Power Supply
Connectors for the Power Supply Unit:
Power supply 230V
AC
/ 24 V
DC
(Two tab terminals, 6.35x0.8 mm)
Batteries (2 x 12V, 17 Ah)
, 24 VDC (Two tab terminals, 6.35x0.8 mm)
Connections as per drawing F665.
3.12 Internal Power supply
Connector for the Web-server 1598:
24 V
DC
9
output (3 ways Molex connector). The total current consumption on this output and
the output for Power supply of external equipment (see above) is maximum 500 mA.
Connections as per drawing F665.
xxxx = type of display unit (e.g. 1728). For more information about each type of unit, see chapter “Other Units”, page 69.
If connected in parallel, Display Units may not reset after an alarm, errors may occur after system reboots, software cannot
download correctly, and/or other unknown system behaviours may occur.
Batteries are not included in the CIE type number. The batteries have to be ordered separately.
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