Operating Instructions

Chapter 2—Hardware Features
Communication Connections
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Siemens Industry, Inc.
Owner's Manual
553-104
Building Technologies
2018-10-01
USB Media Support
● Support for USB mass storage devices (Memory sticks or USB hard drives).
● Backup of database, storage for graphics, Web Server upgrades
Random Access Memory (RAM)
Synchronous Dynamic Random Access Memory (SDRAM) is the working memory of
the PXC Compact. When the PXC Compact has booted and is operating normally, the
APOGEE firmware, the PPCL control program, the point database, and trend data
have been transferred from Flash ROM. Information stored in RAM, such as the point
database or PPCL, may be viewed, modified, deleted, activated, or deactivated from
an operator terminal by any high-level authorized user. In the event of a power loss,
the contents of RAM are kept intact by a backup battery.
PXC Compact RAM size cannot be upgraded in the field.
The program length, number of database points, and number of trend entries is limited
only by available memory.
Communication Connections
The PXC Compact Series provides the following communication connections:
● HMI and Tool ports
● 10B/100B Ethernet port
● RS-485 port
● USB Host Port
● TX-I/O Island Bus (PXC-36 only)
PXC Compact hardware that contains both a 10B/100B Ethernet port and an RS-485
port can be configured through the HMI to reside on any of the following:
● BACnet/IP or Ethernet TCP/IP (P2) ALN
● RS-485 P2 or BACnet MS/TP ALN
NOTE:
Changing the ALN type coldstarts the field panel.
NOTE:
In BACnet/IP or Ethernet TCP/IP (P2) ALN mode, RS-485 parameters are displayed
and may be entered as a selection. However, when in RS-485 ALN mode, BACnet/IP
or Ethernet TCP/IP (P2) ALN parameters are not an available selection.
HMI and Tool Ports
● The HMI port provides a connection to a laptop computer for local operation and
engineering.
● The USB Device port supports a generic serial interface for an HMI or Tool
connection.