diff --git a/lib/busvoodoo_global.c b/lib/busvoodoo_global.c
index 2047354..4bd3448 100644
--- a/lib/busvoodoo_global.c
+++ b/lib/busvoodoo_global.c
@@ -151,19 +151,27 @@ void busvoodoo_safe_state(void)
 	}
 
 	if (busvoodoo_full) {
-		// disable all RS-232 and some RS-485 signals (put back to input floating)
-		gpio_set_mode(GPIO(BUSVOODOO_RS232_TX_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_RS232_TX_PIN));
-		gpio_set_mode(GPIO(BUSVOODOO_RS232_RX_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_RS232_RX_PIN));
-		gpio_set_mode(GPIO(BUSVOODOO_RS232_RTS_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_RS232_RTS_PIN));
-		gpio_set_mode(GPIO(BUSVOODOO_RS232_CTS_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_RS232_CTS_PIN));
+		// disable RS-232 signals
+		gpio_set_mode(GPIO(BUSVOODOO_RS232_TX_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_RS232_TX_PIN)); // set pin to floating
+		gpio_set_mode(GPIO(BUSVOODOO_RS232_RX_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_RS232_RX_PIN)); // set pin to floating
+		gpio_set_mode(GPIO(BUSVOODOO_RS232_RTS_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_RS232_RTS_PIN)); // set pin to floating
+		gpio_set_mode(GPIO(BUSVOODOO_RS232_CTS_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_RS232_CTS_PIN)); // set pin to floating
 		gpio_set(GPIO(BUSVOODOO_RS232_EN_PORT), GPIO(BUSVOODOO_RS232_EN_PIN)); // set high to disable receiver
+		gpio_set_mode(GPIO(BUSVOODOO_RS232_EN_PORT), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO(BUSVOODOO_RS232_EN_PIN)); // use external pull-up resistor to set high by default
 		gpio_clear(GPIO(BUSVOODOO_RS232_SHDN_PORT), GPIO(BUSVOODOO_RS232_SHDN_PIN)); // set low to disable transmitter
+		gpio_set_mode(GPIO(BUSVOODOO_RS232_SHDN_PORT), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO(BUSVOODOO_RS232_SHDN_PIN)); // there is also an external pull-down resistor to disable per default
 
+		// disable RS-485 signals (RS and TX are shared with RS-232)
+		gpio_set(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO(BUSVOODOO_RS485_RE_PIN)); // set high to disable receiver
+		gpio_set_mode(GPIO(BUSVOODOO_RS485_RE_PORT), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO(BUSVOODOO_RS485_RE_PIN)); // use external pull-up resistor to set high by default
+		gpio_clear(GPIO(BUSVOODOO_RS485_DE_PORT), GPIO(BUSVOODOO_RS485_DE_PIN)); // set low to disable transmitter
+		gpio_set_mode(GPIO(BUSVOODOO_RS485_DE_PORT), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO(BUSVOODOO_RS485_DE_PIN)); // there is also an external pull-down resistor to disable per default
+		
 		// disable all CAN and some RS-458 signals (put back to input floating)
-		gpio_set_mode(GPIO(BUSVOODOO_CAN_TX_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_CAN_TX_PIN));
-		gpio_set_mode(GPIO(BUSVOODOO_CAN_RX_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_CAN_RX_PIN));
-		gpio_set_mode(GPIO(BUSVOODOO_CAN_EN_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_CAN_EN_PIN));
-		gpio_set_mode(GPIO(BUSVOODOO_CAN_S_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_CAN_S_PIN));
+		gpio_set_mode(GPIO(BUSVOODOO_CAN_TX_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_CAN_TX_PIN)); // set pin to floating
+		gpio_set_mode(GPIO(BUSVOODOO_CAN_RX_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO(BUSVOODOO_CAN_RX_PIN)); // set pin to floating
+		gpio_set(GPIO(BUSVOODOO_CAN_EN_PORT), GPIO(BUSVOODOO_CAN_EN_PIN)); // set high to power off transceiver
+		gpio_set_mode(GPIO(BUSVOODOO_CAN_EN_PORT), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO(BUSVOODOO_CAN_EN_PIN)); // use external pull-up resistor to set high by default
 	}
 }
 
diff --git a/lib/busvoodoo_global.h b/lib/busvoodoo_global.h
index a9b6a34..1761e96 100644
--- a/lib/busvoodoo_global.h
+++ b/lib/busvoodoo_global.h
@@ -73,13 +73,24 @@
 #define BUSVOODOO_RS232_RX_PIN 3 /**< RS-232 Receive input pin */
 /** @} */
 
+/** @defgroup busvoodoo_rs485 RS-485 (and RS-422) transceiver connection definition
+ *  @{
+ */
+#define BUSVOODOO_RS485_RE_PORT C /**< RS-232 pin to enable receiver (active low, pulled up) */
+#define BUSVOODOO_RS485_RE_PIN 13 /**< RS-232 pin to enable receiver (active low, pulled up) */
+#define BUSVOODOO_RS485_DE_PORT C /**< RS-232 pin to enable transmitter (active high, pulled low) */
+#define BUSVOODOO_RS485_DE_PIN 14 /**< RS-232 pin to enable transmitter (active high, pulled low) */
+#define BUSVOODOO_RS485_TX_PORT A /**< RS-485 Transmit output pin */
+#define BUSVOODOO_RS485_TX_PIN 2 /**< RS-485 Transmit output pin */
+#define BUSVOODOO_RS485_RX_PORT A /**< RS-485 Receive input pin */
+#define BUSVOODOO_RS485_RX_PIN 3 /**< RS-485 Receive input pin */
+/** @} */
+
 /** @defgroup busvoodoo_can CAN transceiver connection definition
  *  @{
  */
-#define BUSVOODOO_CAN_EN_PORT C /**< CAN pin to enable transceiver (active high, pulled low) */
-#define BUSVOODOO_CAN_EN_PIN 14 /**< CAN pin to enable transceiver (active high, pulled low) */
-#define BUSVOODOO_CAN_S_PORT C /**< CAN pin to set to silent mode (active low, pulled high) */
-#define BUSVOODOO_CAN_S_PIN 13 /**< CAN pin to set to silent mode (active low, pulled high) */
+#define BUSVOODOO_CAN_EN_PORT C /**< signal to power CAN transceiver (active high, pulled low) */
+#define BUSVOODOO_CAN_EN_PIN 7 /**< signal to power CAN transceiver (active high, pulled low) */
 #define BUSVOODOO_CAN_TX_PORT B /**< CAN Transmit output pin */
 #define BUSVOODOO_CAN_TX_PIN 9 /**< CAN Transmit output pin */
 #define BUSVOODOO_CAN_RX_PORT B /**< CAN Receive input pin */