Download S4516-DF1 PROGRAM DEVELOPMENT MANUAL - Sea

SECTION 3
USING THE SYSTEM FUNCTIONS
3.3 TRANSMITTING THROUGH THE USER PORT (sfunc11)
The sfunc11 will perform the following functions:
• Assemble the message packet by attaching the starting and ending
control symbols and inserting additional DLE characters as
needed.
• Transmit the message packet.
• Wait for an acknowledge of receipt of transmission.
• Retry the message if the transmission is unsuccessful.
• Return with a response indicating the success of the transmission.
General Form:
sfunc11(#sent,srce);
Parameters:
#sent: The number of bytes to transmit out the
User Port.
Variable Types: Constant (1-250), “B” or
indirect “*B”.
scre:
The address where the first byte transmitted
is stored. A consecutive number of bytes
(= #sent) is transmitted out the USERPORT
starting with this address. Variable types:
“B” or indirect “*B”.
Return Values:
0 = Not Busy, Ready.
1 = Busy.
2 = Done - “DLE ACK” Received.
3 = Done - Error, “DLE NAK” Received.
4 = Done - Error, “DLE ENQ” Time Out.
5 = Done - Error, No Response Time Out.
6 = Done - Error, Packet too Large.
Type:
Simultaneous.
Valid Files:
Initialization, Main Program and User Functions.
S4516-DF1 Program Development Manual
SYSTEMS Electronics Group
-15-