diff --git a/sensgw/protocols/prologix.py b/sensgw/protocols/prologix.py
index a25a5be..2ee7256 100644
--- a/sensgw/protocols/prologix.py
+++ b/sensgw/protocols/prologix.py
@@ -14,6 +14,8 @@ from ..writer import Writer
 
 log = logging.getLogger(__name__)
 
+KEITHLEY_DRIVER_KEYS = {"keithley2000", "keithley_2000"}
+
 
 @dataclass(frozen=True)
 class PrologixBinding:
@@ -27,7 +29,7 @@ def _driver_class(driver_key: str | None) -> type[Any] | None:
     key = (driver_key or "").strip().lower()
     if not key:
         return None
-    if key in {"keithley2000", "keithley_2000"}:
+    if key in KEITHLEY_DRIVER_KEYS:
         from pymeasure.instruments.keithley import Keithley2000  # type: ignore
 
         return Keithley2000
@@ -67,11 +69,8 @@ class PrologixEndpointLoop:
             ":SENS:VOLT:DC:NPLC 10",  # slow/low-noise integration
             ":SENS:VOLT:DC:DIG 7",  # max digits
             # offset drift?
-            ":SYST:AZER ON",
+            ":SYST:AZER:STAT ON",
             ":TRIG:SOUR IMM",
-            ":TRIG:COUN 1",
-            ":SAMP:COUN 1",
-            ":INIT:CONT OFF",
         ]
 
         extra = dev_meta.get("init_cmds")
@@ -80,29 +79,32 @@ class PrologixEndpointLoop:
         return default_cmds
 
     def _init_device(
-        self, gpib_addr: int, driver_key: str | None, meta: dict[str, Any]
+        self, gpib_addr: int, driver_key: str, meta: dict[str, Any]
     ) -> None:
-        dk = (driver_key or "").lower()
-        if "keithley" not in dk:
+        key = (driver_key or "").strip().lower()
+
+        # Only init if the configured driver is explicitly Keithley2000
+        if key not in KEITHLEY_DRIVER_KEYS:
             self._initialized_addrs.add(gpib_addr)
             return
 
         cmds = self._keithley2000_init_cmds(meta)
         log.info(f"Initializing Keithley @ {gpib_addr} with {len(cmds)} SCPI cmds")
 
-        if driver_key:
-            inst = self._get_instrument(gpib_addr, driver_key)
-            # make sure prologix is pointed at the right addr
-            self._get_adapter().address = gpib_addr
-            for cmd in cmds:
-                inst.write(cmd)
-                time.sleep(0.02)
-        else:
-            ad = self._get_adapter()
-            ad.address = gpib_addr
-            for cmd in cmds:
-                ad.write(cmd)
-                time.sleep(0.02)
+        inst = self._get_instrument(
+            gpib_addr, driver_key
+        )  # driver_key is not None here
+        self._get_adapter().address = gpib_addr
+
+        for cmd in cmds:
+            inst.write(cmd)
+            time.sleep(0.02)
+
+            # Read error after each command; stop early if something is wrong
+            err = str(inst.ask(":SYST:ERR?")).strip()
+            if not err.startswith("0,") and "No error" not in err:
+                log.error(f"Keithley init failed at {cmd}: {err}")
+                break
 
         self._initialized_addrs.add(gpib_addr)