diff --git a/src/shearwater_common.c b/src/shearwater_common.c
index f3cdc48..8e4f493 100644
--- a/src/shearwater_common.c
+++ b/src/shearwater_common.c
@@ -441,3 +441,42 @@ shearwater_common_download (shearwater_common_device_t *device, dc_buffer_t *buf
 
 	return DC_STATUS_SUCCESS;
 }
+
+
+dc_status_t
+shearwater_common_identifier (shearwater_common_device_t *device, dc_buffer_t *buffer, unsigned int id)
+{
+	dc_device_t *abstract = (dc_device_t *) device;
+	dc_status_t rc = DC_STATUS_SUCCESS;
+
+	// Erase the buffer.
+	if (!dc_buffer_clear (buffer)) {
+		ERROR (abstract->context, "Insufficient buffer space available.");
+		return DC_STATUS_NOMEMORY;
+	}
+
+	// Transfer the request.
+	unsigned int n = 0;
+	unsigned char request[] = {0x22,
+		(id >> 8) & 0xFF,
+		(id     ) & 0xFF};
+	unsigned char response[SZ_PACKET];
+	rc = shearwater_common_transfer (device, request, sizeof (request), response, sizeof (response), &n);
+	if (rc != DC_STATUS_SUCCESS) {
+		return rc;
+	}
+
+	// Verify the response.
+	if (n < 3 || response[0] != 0x62 || response[1] != request[1] || response[2] != request[2]) {
+		ERROR (abstract->context, "Unexpected response packet.");
+		return DC_STATUS_PROTOCOL;
+	}
+
+	// Append the packet to the output buffer.
+	if (!dc_buffer_append (buffer, response + 3, n - 3)) {
+		ERROR (abstract->context, "Insufficient buffer space available.");
+		return DC_STATUS_NOMEMORY;
+	}
+
+	return rc;
+}
diff --git a/src/shearwater_common.h b/src/shearwater_common.h
index dbb717e..a07de14 100644
--- a/src/shearwater_common.h
+++ b/src/shearwater_common.h
@@ -29,6 +29,9 @@
 extern "C" {
 #endif /* __cplusplus */
 
+#define ID_SERIAL   0x8010
+#define ID_FIRMWARE 0x8011
+
 typedef struct shearwater_common_device_t {
 	dc_device_t base;
 	serial_t *port;
@@ -46,6 +49,9 @@ shearwater_common_transfer (shearwater_common_device_t *device, const unsigned c
 dc_status_t
 shearwater_common_download (shearwater_common_device_t *device, dc_buffer_t *buffer, unsigned int address, unsigned int size, unsigned int compression);
 
+dc_status_t
+shearwater_common_identifier (shearwater_common_device_t *device, dc_buffer_t *buffer, unsigned int id);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
diff --git a/src/shearwater_petrel.c b/src/shearwater_petrel.c
index ac84848..3534a26 100644
--- a/src/shearwater_petrel.c
+++ b/src/shearwater_petrel.c
@@ -61,6 +61,21 @@ static const dc_device_vtable_t shearwater_petrel_device_vtable = {
 };
 
 
+static unsigned int
+str2num (unsigned char data[], unsigned int size, unsigned int offset)
+{
+	unsigned int value = 0;
+	for (unsigned int i = offset; i < size; ++i) {
+		if (data[i] < '0' || data[i] > '9')
+			break;
+		value *= 10;
+		value += data[i] - '0';
+	}
+
+	return value;
+}
+
+
 dc_status_t
 shearwater_petrel_device_open (dc_device_t **out, dc_context_t *context, const char *name)
 {
@@ -148,6 +163,45 @@ shearwater_petrel_device_foreach (dc_device_t *abstract, dc_dive_callback_t call
 		return DC_STATUS_NOMEMORY;
 	}
 
+	// Read the serial number.
+	rc = shearwater_common_identifier (&device->base, buffer, ID_SERIAL);
+	if (rc != DC_STATUS_SUCCESS) {
+		ERROR (abstract->context, "Failed to read the serial number.");
+		dc_buffer_free (buffer);
+		dc_buffer_free (manifests);
+		return rc;
+	}
+
+	// Convert to a number.
+	unsigned char serial[4] = {0};
+	if (array_convert_hex2bin (dc_buffer_get_data (buffer), dc_buffer_get_size (buffer),
+		serial, sizeof (serial)) != 0 ) {
+		ERROR (abstract->context, "Failed to convert the serial number.");
+		dc_buffer_free (buffer);
+		dc_buffer_free (manifests);
+		return DC_STATUS_DATAFORMAT;
+
+	}
+
+	// Read the firmware version.
+	rc = shearwater_common_identifier (&device->base, buffer, ID_FIRMWARE);
+	if (rc != DC_STATUS_SUCCESS) {
+		ERROR (abstract->context, "Failed to read the firmware version.");
+		dc_buffer_free (buffer);
+		dc_buffer_free (manifests);
+		return rc;
+	}
+
+	// Convert to a number.
+	unsigned int firmware = str2num (dc_buffer_get_data (buffer), dc_buffer_get_size (buffer), 1);
+
+	// Emit a device info event.
+	dc_event_devinfo_t devinfo;
+	devinfo.model = 3;
+	devinfo.firmware = firmware;
+	devinfo.serial = array_uint32_be (serial);
+	device_event_emit (abstract, DC_EVENT_DEVINFO, &devinfo);
+
 	while (1) {
 		// Download a manifest.
 		rc = shearwater_common_download (&device->base, buffer, MANIFEST_ADDR, MANIFEST_SIZE, 0);