COM20051 Datasheet, PDF (35/82 Pages) List of Unclassifed Manufacturers – Integrated Microcontroller and ARCNET (ANSI 878.1) Interface

BIT BIT NAME
4,3 Extended
Timeout 1,2
2 Backplane
1,0
Sub
Address 1,0
Table 12 - Configuration Register
SYMBOL
DESCRIPTION
ET1, ET2
These bits allow the network to operate over longer
distances than the default maximum 4 miles by
controlling the Response, Idle, and Reconfiguration
Times. All nodes should be configured with the same
timeout values for proper network operation. The bit
combinations follow.
2.5 Mbps
operation
Response
ET2 ET1 Time (µS)
0 0 1193.6
01
596.8
10
298.4
11
74.7
Idle Time Reconfig
(µS)
Time (mS)
1312
1680
656
1680
328
1680
82
840
BACK-
PLANE
SUBAD 1,0
5 Mbps
operation
Response Idle Time Reconfig
ET2 ET1 Time (µS) (µS)
Time (mS)
00
596.8
656
840
01
298.4
328
840
10
74.7
82
840
11
37.35
41
420
A logic "1" on this bit puts the device into Backplane
Mode signalling which is used for Open Drain and
Differential Driver interfaces.
These bits determine which register at address 07 may
be accessed. The combinations are as follows:
SUBAD1
SUBAD0
Register
0
0 Tentative ID
0
1 Node ID
1
0 Setup
1
1 Next ID
35