Use doAfterIocInit().

iocBoot/iocvxWorks/st_SIS3820.iocsh

@@ -2,7 +2,7 @@
 epicsEnvSet("PREFIX",                   "xxx:3820:")
 epicsEnvSet("RNAME",                    "mca")
 epicsEnvSet("MAX_SIGNALS",              "8")
-epicsEnvSet("MAX_CHANS",                "2000")
+epicsEnvSet("MAX_CHANS",                "1000")
 epicsEnvSet("PORT",                     "SIS3820/1")
 # For MCA records FIELD=READ, for waveform records FIELD=PROC
 epicsEnvSet("FIELD",                    "READ")
@@ -16,13 +16,15 @@ epicsEnvSet("MODEL",                    "SIS3820")
 #                  signals,
 #                  use DMA
 #                  fifoBufferWords)
-drvSIS3820Config($(PORT), 0xA8000000, 224, 6, $(MAX_CHANS), $(MAX_SIGNALS), 1, 0x20000)
+drvSIS3820Config($(PORT), 0xA8000000, 224, 6, $(MAX_CHANS), $(MAX_SIGNALS), 1, 0x2000)
 
 # This loads the scaler record and supporting records
 dbLoadRecords("$(STD)/stdApp/Db/scaler32.db", "P=$(PREFIX), S=scaler1, DTYP=Asyn Scaler, OUT=@asyn($(PORT)), FREQ=50000000")
 
 # This database provides the support for the MCS functions
 dbLoadRecords("$(MCA)/mcaApp/Db/SIS38XX.template", "P=$(PREFIX), PORT=$(PORT), SCALER=$(PREFIX)scaler1")
+# This SNL programs reads the MCS
+doAfterIocInit("seq(&SIS38XX_SNL, 'P=$(PREFIX), R=$(RNAME), NUM_SIGNALS=$(MAX_SIGNALS), FIELD=READ')")
 
 # Load either MCA or waveform records below
 # The number of records loaded must be the same as MAX_SIGNALS defined above
@@ -98,6 +100,3 @@ dbLoadRecords("$(MCA)/mcaApp/Db/simple_mca.db", "P=$(PREFIX), M=$(RNAME)8,  DTYP
 asynSetTraceIOMask($(PORT),0,2)
 #asynSetTraceFile("$(PORT)",0,"$(MODEL).out")
 #asynSetTraceMask("$(PORT)",0,0xff)
-
-# !!! Don't firget to include the following command in st.cmd, after iocInit
-#seq(&SIS38XX_SNL, "P=$(PREFIX), R=$(RNAME), NUM_SIGNALS=$(MAX_SIGNALS), FIELD=$(FIELD)")