Working protocol it seems

Makefile

@@ -6,7 +6,10 @@ BUILDCLASSES=Linux
 EPICS_VERSIONS=7.0.7
 ARCH_FILTER=RHEL%
 
-TEMPLATES += epluse.db
-TEMPLATES += epluse.proto
+REQUIRED+=asyn
+REQUIRED+=stream
+
+TEMPLATES += db/epluse.db
+TEMPLATES += db/epluse.proto
 
 SCRIPTS += epluse.cmd

db/epluse.db

@@ -2,7 +2,7 @@ record(bo, "$(PREFIX):FETCH")
 {
    field(DTYP, "stream")
    field(DESC, "Initialization parameters")
-   field(OUT,"@epluse_rht.proto fetch_rht($(PREFIX)) $(PORT) 0")
+   field(OUT,"@$(PROTO) fetch_rht($(PREFIX)) $(PORT) 0")
    field(SCAN,"1 second")
 }
 

db/epluse.proto

@@ -21,6 +21,6 @@ fetch_rht {
     # 2 ieee_754 floats.
     # Read exactly one char, but drop it. crc8
     # The device sometimes adds an extra 0x00 at the end...weird
-    $ this is handled with ?c command
-    in 0xca 0x8b 0x67 0x0A 0x06 0x00 "%(\$1:TEMP)#R%(\$1:RELHUM)#R%*c%?c";  
+    # this is handled with ?c command
+    in 0xca 0x8b 0x67 0x0A 0x06 0x00 "%(\$1:TEMP)#R%(\$1:RELHUM)#R%*c%*?1c";  
 }

epluse.cmd

@@ -9,4 +9,4 @@ epicsEnvSet("PROTO", "$(epluse_DB)epluse.proto")
 
 drvAsynIPPortConfigure("$(INSTR)-sps", "$(MOXA_ADDR)",0,0,0)
 
-dbLoadRecords("$(epluse_DB)epluse.db", "PREFIX=SQ:$(INSTR), PORT=$(INSTR)-sps")
+dbLoadRecords("$(epluse_DB)epluse.db", "PREFIX=SQ:$(INSTR), PROTO=$(PROTO), PORT=$(INSTR)-sps")