# BASEstartm Classic DAS
for Siemens H1tm Protocol
Installation and User's Guide

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## 2.3.2 Configuring DECnet Plus Parameters

Use SYS$STARTUP:NET$CONFIGURE to configure your OSI Transport Template for Siemens communications.

Note Be sure to configure the template as a NULL Internet transport template.

Table 2-4 gives a list of recommended OSI transport template parameters. Table 2-5 gives a list of OSI transport parameters that may need to be modified for your intallation. These parameters are explained in detail in the DECnet Plus documentation. Some are inter-dependent so that modifying one parameter may require changing other ones also.

Table 2-4 OSI Transport Template Parameters
Parameter | Recommended Value1
--- | ---
Keepalive Time | 3 2
Retransmit Threshold | 2 2
CR Timeout | 5
ER Timeout | 5

1The values of these parameters depends on your specific network configuration and expected response times.
2The product of these values must be lower than the /TIMEOUT value on the device definition.

Table 2-5 OSI Transport Parameters
Parameter
Maximum Transport Connections
Maximum Remote NSAPs

Other timers in the transport template may need to be modified depending on your specific hardware and network configuration.

To modify transport template values place an NCL script in SYS$COMMON:[SYSMGR] and execute it from your system startup command file. Use the following syntax to execute an NCL script.

    $RUN SYS$SYSTEM:NCL
    @SYS$MANAGER:CUSTOM_NCL_SCRIPT.NCL

Example 2-1 shows an example OSI transport template configured for NULL Internet.

Example 2-1 NULL Internet OSI Transport Template

    NCL>sho osi transport template h1net all

    Node 0 OSI Transport Template h1net
    at 1996-10-17-14:49:41.446-04:00Iinf

    Identifiers

        Name                              = h1net

    Characteristics

        Keepalive Time                    = 60
        Retransmit Threshold              = 8
        Initial Retransmit Time           = 5
        CR Timeout                        = 30
        ER Timeout                        = 30
        Network Service                   = CLNS
        Security                          = <Default value>
        Classes                           =
           {
              4
           }
        Checksums                         = True
        Maximum NSDU Size                 = 2048
        Expedited Data                    = True
        CONS Template                     = <Default value>
        Use CLNS Error Reports            = True
        Acknowledgement Delay Time        = 1
        Local NSAP                        = <Default value>
        CLNS Inactive Area Address        =
           {
              49::FF-00
           }
        Inbound                           = True
        Loopback                          = False
        Send Implementation Id            = True
        Extended Format                   = True
        Network Priority                  = 0
        Send Preferred maximum TPDU size  = True
        Send Request Acknowledgement      = True
        RFC1006 Port Number               = 102

Example 2-2 shows an example OSI transport definition.

Example 2-2 OSI Transport

    NCL>sho osi transport all char

    Node 0 OSI Transport
    at 1996-10-17-14:57:47.388-04:00Iinf

    Characteristics

        Maximum Transport Connections     = 200
        Maximum Receive Buffers           = 4000
        Delay Weight                      = 5
        Delay Factor                      = 4
        Maximum Window                    = 20
        Maximum Multiplexing              = 4294967295
        Disconnect Holdback               = 0
        Maximum Network Connections       = 4294967295
        ISO Version                       = 1
        Version                           = V1.1.0
        CONS Classes Supported            =
           {
              0 ,
              2 ,
              4
           }
        CLNS Classes Supported            =
           {
              4
           }
        Support MAP                       = False
        Maximum Remote NSAPs              = 201
        NSAP Selector                     = 33
        CONS Filters                      =
           {
              "OSI Transport"
           }
        Congestion Avoidance              = False
        CONS NSAP Addresses               =
           {
           }
        Maximum RFC1006 Connections       = 4294967295
        RFC1006 Listener Ports            =
           {
               102
           }
        Out Of Order Cache Size           = 10

Furthermore there is a similar set of parameters pre-defined for the Siemens CP-535 communications card. The parameters on the host must match the pre-defined parameters on the Siemens CP-535. Setting the parameters at the recommended values will allow normal communications with the Siemens programmable controller. It is possible to choose other values for these parameters depending on your special network requirements. However, please consult DECnet Plus documentation carefully before changing any of these parameters.

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