Data Interfaces

R/3 IBM Host / AS400
© SAP AG
External program based on IBM CPI-C or APPC
IBM IBM host
host
UNIX
UNIX UNIX
R/3 R/3
OS/2
UNIX
SAP SAP gateway
gateway
NT SNA subsystem
APPC
APPC
CPI-C
CPI-C
LU6.2
LU6.2
APPC
APPC
CPI-C CPI-C
AS400
AS400
If a machine can be accessed via the SNA protocol LU6.2, it always has at least the programming API
APPC (Advanced Program to Program Communication). Communication between external APPC and
SAP CPI-C programs is possible.
Normally, systems accessible via LU6.2 have CPI-C, which is easier to use and itself based on APPC.
This means that communication between external CPI-C programs and SAP CPI-C programs is
guaranteed.
Machines in the IBM AS400 series have both APPC und CPI-C. External programs are started via
SNA-LU6.2:
Entry in TXCOM:
Dest LU TP Prot Gateway host Gateway
service
R3EX host name Ext. prog. C
The name of the TXCOM destination corresponds to an entry in the side information of the SAP gateway
(see also R/3 - R/2 Communication with connection setup from R/3).
Calling an external RFC program is not possible because, at present, no SAP RFC SDK (Software
Development Kit) is supplied for the above platforms.