Honeywell Mercury User Manual page 44

Page 44
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44
Modem Protocol
The main advantage of version 2.20 is the ability to configure the
modem protocol options. The selections are: Yes, No and Auto-de-
tect.
Selecting Yes (default) causes the Mercury Modem to expect
Mercury Modem protocol commands after the initial modem-to-mo-
dem connection. This option will ease host modem setup and give
more reliable connections for systems that will always use the Mer-
cury Modem protocol (Mercury Windows software only). This op-
tion can be viewed as offering some security benefits in that it im-
poses more controlled access to the instrument. It requires the user
to configure Mercury host software to access a specific port, even if
that port is Port A. (Mercury MSDOS software cannot use this mo-
dem option.)
Selecting No causes the Mercury Modem to immediately estab-
lish a transparent connection with Port A. This option will allow
establishing connections with 3rd party DOS or Windows systems
that do not use modem protocol.
Selecting Auto-detect causes the Mercury Modem to behave as
firmware version 2.11, e.g. watching for protocol but allowing some
characters to get through to port A. This option is recommended
only for sites that must be accessed by both protocol-compliant and
protocol-non-compliant host systems.
Figure 34