CEAG Notlichtsysteme GmbH
27
Construction and Function
Assembly and Operating Instructions
Automatic Test System AT-S
+
with STAR
+
Technology
4.4.7 Bus-Technology according to RS 485 or CG-S-Bus
An RS485 bus is used for data communication with external bus modules (DLS/3PH oder TLS).
A connection to a BMS can be done with the CG-S bus.
The conductors of the RS485 bus line must be connected to the connection points RS485 A, RS485 B, +24V OUT
and -24V OUT of the AT-S
+
connection terminals.
ATTENTION!
Bus Topology: linear, double terminated (no spur lines allowed). The absolutely essential terminating resistors are included in the
control cabinet.
Cable type (minimum requirement): IY(ST)Y 4 x 2 x 0.8 mm (Twistet Pair, screened) – the screen of the cables must be
connected to the SE-clamps of each module and it is allowed to be earthed in the control cabinet AT-S
+
.
The conductor cross-section needed for the 24V bus voltage will depend on the line length and the number of bus
modules (U
min
= 19 V DC, refer to the operationg instructions for the DLS/3Ph-Bus-Module and TLS-Bus-Module)
Only one pair of conductors is allowed to be used as data line within the screen - it is not acceptable to bundle several
data cables within one screened cable!
The RS485 bus is not designed as a SELV system. The bus components must be handled as if mains supply (240V) is
applied.
CG-S-Bus
RS485-Bus
Notes:
A parallel switching of data cables is not allowed
and does not lead to an extension of the acceptable
cable length.
For power supply of the modules conductors
within one screening can be switched in parallel (for
calculation compare the catalogue of the system
AT-S
+
).
Summary of Contents for Ceag AT-S+ C0
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