SST SST-PFB-SLC - Page 74

SST-PFB-SLC User’s Guide
66
RspStatus contains the value returned by the LAN controller when it
encounters an error. Mask the value with BFh and use the following table to
determine the meaning. X indicates “do not care” values in the upper half of
the byte.
If the destination station sends reply data, the reply data length in bytes is in
RxLen. Possible values are 0 to 244. The reply data itself is found in RxData.
Sending Broadcast and Multicast Messages
Broadcast and multicast messages are sent to destination station 127.
Broadcast messages are sent to destination SAP 63. The frame control must
be SDNl or SDNh as all broadcast/multicast messages are unconfirmed.
In order for the destination station to receive a broadcast or multicast
message, it must have strict station checking disabled. To receive a broadcast
message, it must have a SAP configured on SAP 63.
Value, hex Meaning
X0 OK
X1 user error, SAP locked, the destination station did not
accept the message because the SAP was locked
X2 no resource for send data, the SAP could not accept the
message. For example, this happens when the SAP’s
receive buffer is too small.
X3 no service available (destination SAP doesn’t exist, or
when strict frame control checking is enabled on the
destination station and there’s a mismatch)
X4 access point blocked
80 short character, problems with wiring, termination, etc.
9F no access, the destination station isn’t there
AF double token detected, problems with wiring, termination,
etc.
BF response buffer too small
8F noise at SM command, problems with wiring, termination,
etc.