diff --git a/bundles/org.openhab.core.io.transport.modbus/src/main/java/org/openhab/core/io/transport/modbus/internal/ModbusManagerImpl.java b/bundles/org.openhab.core.io.transport.modbus/src/main/java/org/openhab/core/io/transport/modbus/internal/ModbusManagerImpl.java
index 8c75042aaee..4f34d1b3064 100644
--- a/bundles/org.openhab.core.io.transport.modbus/src/main/java/org/openhab/core/io/transport/modbus/internal/ModbusManagerImpl.java
+++ b/bundles/org.openhab.core.io.transport.modbus/src/main/java/org/openhab/core/io/transport/modbus/internal/ModbusManagerImpl.java
@@ -284,6 +284,12 @@ public void accept(AggregateStopWatch timer, WriteTask task, ModbusSlaveConnecti
      */
     private static final String MODBUS_POLLER_THREAD_POOL_NAME = "modbusManagerPollerThreadPool";
 
+    /**
+     * The slave exception code indicating that the device is currently busy processing another
+     * command.
+     */
+    private static final int MODBUS_EXCEPTION_SLAVE_DEVICE_BUSY = 6;
+
     /**
      * Log message with WARN level if the task queues exceed this limit.
      *
@@ -662,7 +668,11 @@ private <R, C extends ModbusResultCallback, F extends ModbusFailureCallback<R>,
                 } catch (ModbusSlaveException e) {
                     lastError.set(new ModbusSlaveErrorResponseExceptionImpl(e));
                     // Slave returned explicit error response, no reason to re-establish new connection
-                    if (willRetry) {
+                    if (willRetry && e.getType() == MODBUS_EXCEPTION_SLAVE_DEVICE_BUSY) {
+                        logger.debug(
+                                "Try {} out of {} failed when executing request ({}). The slave device is busy (exception code {}). Will try again soon. [operation ID {}]",
+                                tryIndex, maxTries, request, e.getType(), operationId);
+                    } else if (willRetry) {
                         logger.warn(
                                 "Try {} out of {} failed when executing request ({}). Will try again soon. Error was: {} {} [operation ID {}]",
                                 tryIndex, maxTries, request, e.getClass().getName(), e.getMessage(), operationId);