NetIPC 3000/XL Programmer's Reference Manual (5958-8600)

212 AppendixD
Migration From PTOP to NetIPC and RPM
Exchanging Data
Exchanging Data: In the Master Program
To convert the PTOP intrinsic listed below, perform the following steps.
lgth := PREAD ( dsnum ,target,tcount[,itag]
• If the slave requires a master function, send the PREAD request
function (=2) on the virtual circuit to the slave.
• If the slave requires the requested data length, send tcount on the
virtual circuit.
• If a tag is specified, send the master tag on the virtual circuit.
• If the master needs to know the actual data length sent from the
slave, receive the actual data length from the virtual circuit.
• If the slave may call either ACCEPT or REJECT, receive a one byte
accept or reject indication on the virtual circuit from the slave.
Otherwise assume the slave accepted the request.
• If the slave accepted the request, receive the target data from the
slave, using either a predetermined length or the actual data length
received in Step 4.
• If a tag is specified, receive the slave tag from the virtual circuit.
To convert the PTOP intrinsic listed below, perform the following steps: