Honeywell ACS-8, Installation Instructions Manual

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Installation Instructions / ACS-8 53
9.4 Installing the communication module
Warning! Destruction of the PCB possible!
Never remove the cable from ST1 of the communication module or from ST2 of the ACS-8
while the device is in operation!
Switch the ACS-8 off. Use antistatic handling precautions before taking the communication module out of the
antistatic bag. Hold the communication module by gripping only the sides and avoid touching the connectors.
Fit the communication module to the mounting pillars and screw it in place. Connect it to the CPU board of the
ACS-8 with the attached cable.
ST1 on the communication module links to ST2 on the CPU board
Pin assignments (also see chapter 8.4):
ST1: - Connection of a single communication module to the ACS-8.
- Connection of the first (lower) communication module to the ACS-8 (when using 2 communication
modules).
ST3: 12V DC and 0V supplied from the power supply unit. WARNING! Ensure that the polarity is correct!
BU1 and BU 2 are used only if two communication modules are installed.
BU1: Not used for the first (lower) communication module.
By the second (upper) communication module for connection to the first (lower) one.
BU2: By the first (lower) communication module for connection to the second (upper) one.
ST102, ST103: RS 485 bus termination lower terminal strip.
ST202, ST203: RS 485 bus termination upper terminal strip.