I added a driver for the EL755 magnet controller using streamdevice

iocBoot/iocsinqEPICS/stel755.cmd

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+#!../../bin/linux-x86-debug/sinqEPICS
+# for debugging..................
+## You may have to change sinqEPICS to something else
+## everywhere it appears in this file
+
+< envPaths
+
+cd ${TOP}
+
+## Register all support components
+dbLoadDatabase "$(TOP)/dbd/sinqEPICS.dbd"
+dbLoadDatabase "$(TOP)/sinqEPICSApp/src/sinq.dbd"
+sinqEPICS_registerRecordDeviceDriver pdbbase
+
+## Load record instances
+#dbLoadRecords("db/xxx.db","user=koenneckeHost")
+
+
+#---------- Install SLSVME
+drvAsynIPPortConfigure("el755", "narziss-ts:3004",0,0,0)
+#drvAsynIPPortConfigure("slsvme", "localhost:8080",0,0,0)
+
+dbLoadRecords("$(ASYN)/db/asynRecord.db","P=SQ:NZ:,R=el755,PORT=el755,ADDR=0,OMAX=80,IMAX=80")
+
+epicsEnvSet ("STREAM_PROTOCOL_PATH", "$(TOP)/sinqEPICSApp/Db:.")
+
+cd ${TOP}/iocBoot/iocsinqEPICS
+dbLoadRecords("$(TOP)/sinqEPICSApp/Db/el755.db","PREFIX=SQ:NZ:AMAG:,NO=2")
+
+
+iocInit
+
+## Start any sequence programs
+#seq sncxxx,"user=koenneckeHost"

sinqEPICSApp/Db/el755.db

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+## 
+## Read the Current
+##  
+record(ai, "$(PREFIX)CurRBV") {
+  field(DTYP, "stream")
+  field(DESC, "Current Readback")
+  field(INP, "@el755.proto read($(NO)) el755 0")
+  field(SCAN, "1 second")
+  field(PREC, "3")
+  field(EGU, "A")
+}
+
+## 
+## Set the current
+##
+record(ao, "$(PREFIX)CurSet") {
+  field(DTYP, "stream")
+  field(DESC, "Setpoint current")
+  field(OUT, "@el755.proto write($(NO)) el755 0")
+  field(PREC, "3")
+  field(EGU, "A")
+}

sinqEPICSApp/Db/el755.proto

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+# Streamdevice protocol file for the PSI EL755 Magnet Controller
+
+InTerminator = "\r";
+OutTerminator = "\r";
+#ExtraInput = Ignore;
+
+read {
+     out "I \$1";
+     in  "%*f %f";
+     @mismatch {out "RMT 1";
+                in "";
+		out "ECHO 0";
+                in "";
+     }
+}
+
+
+write {
+      out "I \$1 %f";
+      in "";
+}
+