diff --git a/components/freemodbus/port/port.h b/components/freemodbus/port/port.h
index 84d3d3f..81c3cd2 100644
--- a/components/freemodbus/port/port.h
+++ b/components/freemodbus/port/port.h
@@ -37,7 +37,7 @@
 #define MB_SERIAL_BUF_SIZE              (CONFIG_FMB_SERIAL_BUF_SIZE)
 
 // common definitions for serial port implementations
-#define MB_SERIAL_TX_TOUT_MS            (100)
+#define MB_SERIAL_TX_TOUT_MS            (2200) // maximum time for transmission of longest allowed frame buffer
 #define MB_SERIAL_TX_TOUT_TICKS         (pdMS_TO_TICKS(MB_SERIAL_TX_TOUT_MS)) // timeout for transmission
 #define MB_SERIAL_RX_TOUT_MS            (1)
 #define MB_SERIAL_RX_TOUT_TICKS         (pdMS_TO_TICKS(MB_SERIAL_RX_TOUT_MS)) // timeout for receive
diff --git a/components/freemodbus/port/portserial_m.c b/components/freemodbus/port/portserial_m.c
index 023bcd0..6439442 100644
--- a/components/freemodbus/port/portserial_m.c
+++ b/components/freemodbus/port/portserial_m.c
@@ -115,7 +115,7 @@ BOOL xMBMasterPortSerialTxPoll(void)
         ESP_LOGD(TAG, "MB_TX_buffer sent: (%d) bytes.", (uint16_t)(usCount - 1));
         // Waits while UART sending the packet
         esp_err_t xTxStatus = uart_wait_tx_done(ucUartNumber, MB_SERIAL_TX_TOUT_TICKS);
-        vMBMasterPortSerialEnable( TRUE, FALSE );
+        vMBMasterPortSerialEnable(TRUE, FALSE);
         MB_PORT_CHECK((xTxStatus == ESP_OK), FALSE, "mb serial sent buffer failure.");
         return TRUE;
     }
diff --git a/components/freemodbus/serial_master/modbus_controller/mbc_serial_master.c b/components/freemodbus/serial_master/modbus_controller/mbc_serial_master.c
index 426a455..58bb1aa 100644
--- a/components/freemodbus/serial_master/modbus_controller/mbc_serial_master.c
+++ b/components/freemodbus/serial_master/modbus_controller/mbc_serial_master.c
@@ -61,7 +61,7 @@ static void modbus_master_task(void *pvParameters)
             // Send response buffer if ready to be sent
             BOOL xSentState = xMBMasterPortSerialTxPoll();
             if (xSentState) {
-                // Let state machine know that response was transmitted out
+                // Let state machine know that request frame was transmitted out
                 (void)xMBMasterPortEventPost(EV_MASTER_FRAME_SENT);
             }
         }