diff --git a/src/buildnum.h b/src/buildnum.h
index e68922d6..532b3d51 100644
--- a/src/buildnum.h
+++ b/src/buildnum.h
@@ -1 +1 @@
-#define BUILDNUMBER 1883
+#define BUILDNUMBER 1884
diff --git a/src/comm.h b/src/comm.h
index 157d6250..ceddba85 100644
--- a/src/comm.h
+++ b/src/comm.h
@@ -24,7 +24,7 @@
 
 #define COMM_STACK_SIZE		336   // must be evenly divisible by 8
 #define COMM_PRIORITY		40
-#define COMM_NOTICE_DEPTH	24    // must be power of 2
+#define COMM_NOTICE_DEPTH	36    // must be power of 2
 #define COMM_NOTICE_LENGTH	64
 
 #define COMM_LOG_BUF_SIZE	512
diff --git a/src/filer.c b/src/filer.c
index 6298ed4f..5092bdea 100644
--- a/src/filer.c
+++ b/src/filer.c
@@ -40,7 +40,7 @@ static int32_t filerProcessWrite(filerFileStruct_t *f) {
     if (!f->open) {
 	res = f_open(&f->fp, f->fileName, FA_CREATE_ALWAYS | FA_WRITE);
 	if (res != FR_OK)
-	    return -1;
+	    return FILER_STATUS_ERR_OPEN;
 
 	f->open = 1;
     }
@@ -49,14 +49,14 @@ static int32_t filerProcessWrite(filerFileStruct_t *f) {
 	res = f_lseek(&f->fp, f->seek);
 	if (res != FR_OK) {
 	    f->open = 0;
-	    return -1;
+	    return FILER_STATUS_ERR_SEEK;
 	}
     }
 
     res = f_write(&f->fp, f->buf, f->length, &bytes);
     if (res != FR_OK) {
 	f->open = 0;
-	return -1;
+	return FILER_STATUS_ERR_WRITE;
     }
 
     return bytes;
@@ -68,8 +68,12 @@ static int32_t filerProcessRead(filerFileStruct_t *f) {
 
     if (!f->open) {
 	res = f_open(&f->fp, f->fileName, FA_OPEN_EXISTING | FA_READ);
-	if (res != FR_OK)
-	    return -1;
+	if (res != FR_OK) {
+	    if (res == FR_NO_FILE || res == FR_NO_PATH)
+		return FILER_STATUS_ERR_FNF;
+	    else
+		return FILER_STATUS_ERR_OPEN;
+	}
 
 	f->open = 1;
     }
@@ -78,14 +82,14 @@ static int32_t filerProcessRead(filerFileStruct_t *f) {
 	res = f_lseek(&f->fp, f->seek);
 	if (res != FR_OK) {
 	    f->open = 0;
-	    return -1;
+	    return FILER_STATUS_ERR_SEEK;
 	}
     }
 
     res = f_read(&f->fp, f->buf, f->length, &bytes);
     if (res != FR_OK) {
 	f->open = 0;
-	return -1;
+	return FILER_STATUS_ERR_READ;
     }
 
     return bytes;
@@ -95,13 +99,13 @@ static int32_t filerProcessSync(filerFileStruct_t *f) {
     uint32_t res;
 
     if (!f->open) {
-	return -1;
+	return FILER_STATUS_ERR_OPEN;
     }
 
     res = f_sync(&f->fp);
     if (res != FR_OK) {
 	f->open = 0;
-	return -1;
+	return FILER_STATUS_ERR_SYNC;
     }
 
     return 0;
@@ -116,7 +120,7 @@ static int32_t filerProcessStream(filerFileStruct_t *f, uint8_t final) {
 	sprintf(filerData.buf, "%03d-%s.LOG", filerData.session, f->fileName);
 	res = f_open(&f->fp, filerData.buf, FA_CREATE_ALWAYS | FA_WRITE);
 	if (res != FR_OK)
-	    return -1;
+	    return FILER_STATUS_ERR_OPEN;
 
 	f->open = 1;
     }
@@ -132,7 +136,7 @@ static int32_t filerProcessStream(filerFileStruct_t *f, uint8_t final) {
 	f->tail = (f->tail + bytes) % f->length;
 
 	if (res != FR_OK)
-	    return -1;
+	    return FILER_STATUS_ERR_WRITE;
     }
 
     return bytes;
@@ -147,9 +151,9 @@ static int32_t filerProcessClose(filerFileStruct_t *f) {
     }
 
     if (res != FR_OK)
-	return -1;
+	return FILER_STATUS_ERR_CLOSE;
     else
-	return 0;
+	return FILER_STATUS_OK;
 }
 
 static void filerProcessRequest(filerFileStruct_t *f) {
@@ -369,13 +373,13 @@ int8_t filerGetHandle(char *fileName) {
     }
 
     // too many files open
-    return -1;
+    return FILER_STATUS_ERR_ALLOC;
 }
 
 int32_t filerReadWrite(filerFileStruct_t *f, void *buf, int32_t seek, uint32_t length, uint8_t function) {
     // handle allocated yet?
     if (!f->allocated || !filerData.initialized)
-	return -1;
+	return FILER_STATUS_ERR_INIT;
 
     f->buf = buf;
     f->function = function;
@@ -404,7 +408,7 @@ int32_t filerSync(int8_t handle) {
 
     // handle allocated yet?
     if (!f->allocated)
-	    return -1;
+	return FILER_STATUS_ERR_INIT;
 
     if (f->open) {
 	f->function = FILER_FUNC_SYNC;
@@ -422,7 +426,7 @@ int32_t filerClose(int8_t handle) {
 
     // handle allocated yet?
     if (!f->allocated)
-	    return -1;
+	return FILER_STATUS_ERR_INIT;
 
     if (f->open) {
 	f->function = FILER_FUNC_CLOSE;
@@ -450,7 +454,7 @@ int32_t filerStream(int8_t handle, void *buf, uint32_t length) {
 
     // handle allocated yet?
     if (!f->allocated)
-	    return -1;
+	return FILER_STATUS_ERR_INIT;
 
     f->function = FILER_FUNC_STREAM;
     f->buf = buf;
diff --git a/src/filer.h b/src/filer.h
index a88057eb..06a2f9b1 100644
--- a/src/filer.h
+++ b/src/filer.h
@@ -45,6 +45,19 @@ enum {
     FILER_STATE_MSC_ACTIVE
 };
 
+enum fileReturnStatus {
+    FILER_STATUS_ERR_CLOSE = -9,	// error while closing an opened file
+    FILER_STATUS_ERR_SYNC  = -8,	// synch error on opened file
+    FILER_STATUS_ERR_WRITE = -7,	// error writing to opened file
+    FILER_STATUS_ERR_READ  = -6,	// error reading from opened file
+    FILER_STATUS_ERR_SEEK  = -5,	// seek error on opened file
+    FILER_STATUS_ERR_OPEN  = -4,	// no file/could not open
+    FILER_STATUS_ERR_FNF   = -3,	// file/path not found
+    FILER_STATUS_ERR_ALLOC = -2,	// could not allocate file handle, too many files open
+    FILER_STATUS_ERR_INIT  = -1,	// file system not initialized or resource not allocated
+    FILER_STATUS_OK        =  0,	// anything this or greater is OK (FR_OK equivalent)
+};
+
 #define filerEnableMSC()	{if (filerData.mscState == FILER_STATE_MSC_DISABLE) filerData.mscState = FILER_STATE_MSC_REQUEST;}
 #define filerEjectMSC()		{filerData.mscState = FILER_STATE_MSC_EJECT;}
 #define filerGetMSCState()	(filerData.mscState)