DD

JFB 20-May-99

MIL/STD 1553 Field Bus

J. Frederick Bartlett

Fermilab

DD

JFB 20-May-99

MIL/STD 1553 Field Bus Support

The MIL/STD-1553B standard 1 MHz clock Manchester II bi-phase code Transformer coupling Bus lengths 100 meters+ 16-bit word size 20 μ sec/word Status word for each

transaction High noise rejection Very Robust

DD

JFB 20-May-99

MIL/STD 1553 Field Bus Properties

Addressing structure Remote terminal (RT) - 31 Broadcast (all RT’s) Subaddress - 30 Word count - 1 to 32 Mode control function

DD

JFB 20-May-99

VxWorks/EPICS 1553 Support

VxWorks Driver Uses a POSIX queue for

serialization Multiple transactions per

queue element (atomic) User callback function Long data blocks sequenced

as multiple transactions by the driver

EPICS driver wrapper

DD

JFB 20-May-99

VxWorks/EPICS 1553 Support

Generic record (mil1553) No device module

Generic device AI, AO, BI, BO, LONGIN,

LONGOUT, MBBI, MBBO, WF

Rack monitor Complex record example 1U rack profile 64 A/D channels

Read with two 1553 transactions 8 D/A channels 4 binary channels

Input/output selection 32 word per channel