diff --git a/zcancmder_protocol_basic.hpp b/zcancmder_protocol_basic.hpp
index 8762ea8..591d86d 100644
--- a/zcancmder_protocol_basic.hpp
+++ b/zcancmder_protocol_basic.hpp
@@ -32,8 +32,7 @@
     static_assert(sizeof(*ack) < sizeof(m_txbuf), "ack size too large"); \
     auto __attribute__((unused)) cmdheader = rxcmd->get_cmdheader();     \
     uint32_t errorcode                     = 0;                          \
-    if (cmd->id == varid) {                                              \
-
+    if (cmd->id == varid) {
 #define PROCESS_REPORT(type)                                                 \
   zlock_guard l(m_lock);                                                     \
   auto*       report = (type##_report_t*)m_txbuf;                            \
@@ -83,3 +82,5 @@ typedef enum {
 
 }  // namespace zcr
 }  // namespace iflytop
+
+#define ZCAN_CMD_PUBLIC_DEVICE_ID_STEP_MOTOR_BOARD_OFFEST 200