User's Manual

340 Module - eESPA
from the controlling station, the slave becomes temporarily master station.
Only a master station is able to send data blocks. A master station always
sends data; a slave always receives. In this scenario, the controlling
station becomes (temporarily) a slave.
Every eESPA module has a status bar with some additional information
about the actual communication situation.
•
The label Receiving shows the timestamp and the latest incoming
databits. Values that can appear on this label are as follows: ACK,
NAK, EOT, address + ENQ, SOH (start of data), and data.
• The label Sent shows the timestamp and the databit that was last sent.
Values that can appear on this label are as follows: ACK, NAK, EOT,
address + ENQ, SOH (start of data), and data.
•
The Local address field shows the defined value of eESPA_L
ocalAddress_n in the eESPA table. Nortel recommends that
you set the controlling station local address to 1. The field
eESPA_ControlStation_b in the eESPA table defines whether this
module is a controlling station or not.
In the DECT Messenger model, a module always communicates with
one other module (master to slave or point to point). The address of
the other station is defined in the eESPA_ExternalAddress_n field in
the eESPA table. In the case of a non-controlling module (defined by
setting eESPA_ControlStation_b on No in the database), for example,
you can use a local address of 2 and an external address of 1. In this
case, the module communicates directly with the controlling station.
•
The label Status shows log information to allow users to see special
actions.
Figure 85 "Status of master/slave" (page 340) shows an example of the
eESPA status bar.
Figure 85
Status of master/slave
Logging
In the Logging tab, only basic (default) logging is shown.
Basic logging: incoming and outgoing data on the communication
port (I:COM and O:COM), incoming and outgoing data on the socket
communication with the eKernel (I:TCP and O:TCP), and warning
information.
Nortel Communication Server 1000
DECT Messenger Installation and Commissioning — Book 1
NN43120-301 02.01 4 June 2010
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