diff --git a/backend_dnpds40.c b/backend_dnpds40.c
index 4aa86ae..5adf68d 100644
--- a/backend_dnpds40.c
+++ b/backend_dnpds40.c
@@ -639,6 +639,7 @@ static const char *dnpds40_statuses(int status)
 	case 2610: return "Abnormal Paper Motor Temperature";
 	case 2700: return "Ribbon Tension Error";
 	case 2800: return "RF-ID Module Error";
+	case 2900: return "RS422 Communiation Error";
 	case 3000: return "System Error";
 	case 9999: return "Communication Failure"; /* Special */
 	default: