Installation guide

Modbus Plus Transaction Elements
890 USE 100 00
183
MAC/LLC Data
This field specifies the MAC level control packet for tokenrelated
operations, and contains both the MAC and LLC level packets for
datamessage related operations.
If the message relates to the tokenpassing operation of the network,
the field will contain only the MAC level information necessary to
identify a successor. If the message contains data, the field will contain
both MAC and LLC level information.
The MAC and LLC level packets are detailed on the following pages.
Frame Check Sequence
Two bytes containing the CRC16 frame error checksum.
Closing Flag
One byte, 0x7E (one ZERO, six ONES, one ZERO).