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Chapter 3: Configuring the
Communication Port Table (A197_COM)
The Communication Port A197_COM table contains the relevant configuration information for
communication port setup. Each record in the Communication Port table defines the
communication parameters for a single communication port.
Table 3 Communication Port Configuration Table Parameters
Name Range Description
First SRU record Indexes A197_SRU This parameter contains the first SRU table record to associate with
this communication port.
Number of SRUs Number of Records of
A197_SRU table
This parameter contains the number of SRU table records to
associate with this communication port. The range of SRUs
specified by First SRU and Number of SRUs must specify a valid
range of A196_SRU records.
In the SRU is configured for Full-Duplex Mode, the Number of
SRUs should be set to 1.
Retries Before
Failure
0 .. 65535 This parameter defines the number of times to retry a message
before reporting a communication failure.
A typical value is 3.
Failures Before
Off-line
1 .. 65535 This parameter defines the number of consecutive communication
failures that cause a SRU to be taken off- line.
A typical value is 3.
Communication
Port
Any valid communication
port (hardware dependent)
COM1 – COM7
This parameter contains the ASCII descriptor for the communication
port to use. For example, for the D20, valid communication ports are
“COM1” through “COM7”.
Baud Rate 110, 300, 600, 1200, 2400,
4800, 7200, 9600, 19.2k,
38.4k
This parameter specifies the communication baud rate to use on this
port.
A typical value is 9600.
Data Bits 7 or 8 This parameter specifies the number of bits used for data.