+#define DMM_COUNT 4
+
+struct dmm_info {
+ char *vendor;
+ char *device;
+ uint32_t baudrate;
+ int packet_size;
+ int (*packet_request)(struct sr_serial_dev_inst *);
+ gboolean (*packet_valid)(const uint8_t *);
+ int (*packet_parse)(const uint8_t *, float *,
+ struct sr_datafeed_analog *, void *);
+ void (*dmm_details)(struct sr_datafeed_analog *, void *);
+ struct sr_dev_driver *di;
+ int (*receive_data)(int, int, void *);
+};
+
+extern SR_PRIV struct dmm_info udmms[DMM_COUNT];