diff --git a/util/modbus/modbus.go b/util/modbus/modbus.go
index 1e55ed84f..3d8282b76 100644
--- a/util/modbus/modbus.go
+++ b/util/modbus/modbus.go
@@ -158,6 +158,8 @@ func NewConnection(uri, device, comset string, baudrate int, wire WireFormat, sl
 	if device != "" {
 		switch strings.ToUpper(comset) {
 		case "8N1", "8E1":
+		case "80":
+			comset = "8E1"
 		default:
 			return nil, fmt.Errorf("invalid comset: %s", comset)
 		}