Operating Instructions

Chapter 2—Hardware Features
Communication Connections
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Siemens Industry, Inc.
Owner's Manual
588-682
Building Technologies
2019-01-25
Random Access Memory (RAM)
Synchronous Dynamic Random Access Memory (SDRAM) is the working memory of
the TC Compact. When the TC Compact has booted and is operating normally, the
TALON 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.
TC 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 TC 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 (TC-36 only)
NOTE:
In BACnet/IP ALN mode, RS-485 parameters are displayed and may be entered as a
selection. However, when in RS-485 ALN mode, BACnet/IP 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.
Human-Machine Interface (HMI)/Tool Port
The Human-Machine Interface (HMI)/Tool port provides RS-232 compliant
communications through a quick-connect RJ-45 jack. The HMI port supports the
following functionality:
● Connecting a machine interface device, such as an operator terminal or a text-
based operator terminal, to the TC Compact.
● Executing firmware flash upgrades.
● 1200 bps to 115.2 Kbps communication is supported.
NOTE:
The communication speed of the port must match the communication speed of the
device connected to it.