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Quadrus Verifier User’s Manual
A-23
Appendices
Appendix J — Interface Standards
Interface Standards, established by the Electronic Industries Association (EIA), specify such
things as the signaling voltage levels, maximum cable lengths, and number of drivers. With
Microscan devices, selection of interface is made by pin assignment.
RS-232
RS-232 defines an interface between two devices such as, for example, the Verifier and
host. It differs from other interfaces by dedicating individual pins to specific functions
and by requiring both devices to share a common ground line. Since both device chassis
are connected to a common ground, a ground loop potential and the possibility of noise
interference exists. Therefore cable lengths are limited to a maximum of 50 feet (19.7m).
Despite being the most limited, this interface is used frequently because of the large
installed base of RS-232 equipment.
Ethernet
Ethernet is supported for 10 Mbps per second with packets between 64 and roughly
1,500 bytes in length. A 6-byte address is used, which is divided into a 3-byte vendor ID
and a 3-byte vendor-defined field. Ethernet manufacturers are assigned a unique vendor
ID, and are then responsible for insuring that all of their devices have unique addresses
in the last 3 bytes.
Содержание Quadrus Verifier
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Страница 178: ...5 26 Quadrus Verifier User s Manual Aux Port System Data Status ...
Страница 210: ...6 32 Quadrus Verifier User s Manual Setting Up the Verifier for EZ Trax ...
Страница 302: ...8 62 Quadrus Verifier User s Manual Configuring EZ Trax Output ...
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Страница 390: ...14 22 Quadrus Verifier User s Manual Status Requests ...
Страница 404: ...15 14 Quadrus Verifier User s Manual Ordered Output Filter ...
Страница 444: ...A 30 Quadrus Verifier User s Manual Glossary of Terms ...