GE GEFanuc Automation Programmable Control Products TCP/IP Ethernet Communications for the Series 90t-70 PLC GFK-1004B - Manual (Page 77)

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3-25 GFK-1004B Chapter 3 The GEnet System Manager–Station Configuration
Data Link Parameters Screen
The Data Link Parameters Screen allows you to modify the Data Link Layer communica-
tions parameters. In most cases the values of these parameters will remain the default
values. The Data Link Parameters menu is shown below.
Figure 3-8. Data Link Parameters Screen
The Data Link Parameters are defined as follows:
TX_RING_LEN - The maximum number of frames which can be queued for transmis-
sion on the network. Valid values are 8, 16, 32, 64, and 128 frames. Defaults to 8
frames. Value selected by Tab or Shift-Tab keys. Corresponds to Station Manager
Parameter ltxringlen.
RX_RING_LEN - The maximum number of incoming frames received by this station
which can be queued for processing. Valid values are 8, 16, 32, 64, and 128 frames.
Defaults to 64 frames. Value selected by Tab or Shift-Tab keys. Corresponds to Sta-
tion Manager Parameter lrxringlen.
LLC_MAX_BUF - The maximum data size of Link Layer receive buffers. This the largest
possible receive frame for the Link Layer. Valid range of 128 to 1497 bytes. Defaults
to 1497 bytes. Should be at least 70 less than the Maximum Buffer Size (see the Sys-
temParameters Menu). Corresponds to Station Manager Parameter lmaxdb.
DISAB_TX_RTRY - Prevents the normal automatic TX retries when a frame collision oc-
curs during transmission. Valid values are “Y” and “N”. “Y” specifies that TX retries
are disabled. “N” specifies that each TX frame will be retried up to 16 times. Defaults
to “N”. Corresponds to Station Manager Parameter ldrtry.