diff --git a/Src/CanSerialPortFrameTP.c b/Src/CanSerialPortFrameTP.c
index 52ca9ac..39ff24a 100644
--- a/Src/CanSerialPortFrameTP.c
+++ b/Src/CanSerialPortFrameTP.c
@@ -105,7 +105,7 @@ uint16_t sendFlowFrame(tCanSerialPortFrameTp *env, uint32_t id, uint32_t timeout
     frame->blockSize = 0;
     frame->timeST = 0;
 
-    SystemDelayMs(timeout_StMin);
+    SystemDelayMs(timeout_StMin); // !!!
     uint16_t sent = env->ioCanFrame->transmit(env->ioCanFrame->env, (uint8_t *) frame, 8, id,
                                               PROTOCOL_CAN_TYPE_UDS, timeout);
 
@@ -124,6 +124,7 @@ uint16_t sendSingleFrame(tCanSerialPortFrameTp *env, uint8_t *data, uint16_t siz
 
     memcpy(&frame->data[0], data, size);
 
+    SystemDelayMs(timeout_StMin);
     uint16_t sent = env->ioCanFrame->transmit(env->ioCanFrame->env, (uint8_t *) frame, 8, id,
                                               PROTOCOL_CAN_TYPE_UDS, timeout);
 
@@ -357,7 +358,8 @@ bool sendFirstFrame(tCanSerialPortFrameTp *env, uint8_t *data, uint16_t size, ui
     memcpy(&frame->data[0], &data[pDataLen], 6);
     pDataLen += 6;
 
-    uint16_t sent = env->ioCanFrame->transmit(env->ioCanFrame->env, (uint8_t *) frame, 8, id,
+    SystemDelayMs(timeout_StMin);
+    env->ioCanFrame->transmit(env->ioCanFrame->env, (uint8_t *) frame, 8, id,
                                               PROTOCOL_CAN_TYPE_UDS, timeout);
 
     bool result = waitFlowControl(env);