User`s guide

2: ADCCP NRM Protocol Summary
DC 900-1317J 33
2.2 Balanced Configurations
Some applications require two stations (one local and one remote) to exchange control
and information. ADCCP achieves this by defining a set of procedures for balanced
mode operation.
A balanced configuration (see Figure 2–2) operates in asynchronous balanced mode,
which functions much as if each station contained both a primary station and a second-
ary station operating in asynchronous response mode. However, in ADCCP each com-
bined station is considered to be a single station, so that a link between two combined
stations is established if and only if the primary function in each communicates with the
secondary function in the other. That is, the link is not established unless it is truly bal-
anced.
2.3 Symmetric Configurations
A symmetric configuration (see Figure 2–3) is much like a balanced configuration,
except that four stations (two primary and two secondary) and two virtual data links are
Figure 2–2: Balanced Configuration
Station A Commands
Station B Responses
Station B Commands
Station A Responses
DRWG-0527
Local
Combined
Station
A
Remote
Combined
Station
B