Update baud rate for TS480

rigs/kenwood/ts480.c

@@ -641,8 +641,8 @@ const struct rig_caps pt8000a_caps =
     .ptt_type = RIG_PTT_RIG_MICDATA,
     .dcd_type = RIG_DCD_RIG,
     .port_type = RIG_PORT_SERIAL,
-    .serial_rate_min = 4800,
-    .serial_rate_max = 115200,
+    .serial_rate_min = 9600,
+    .serial_rate_max = 57600,
     .serial_data_bits = 8,
     .serial_stop_bits = 1,
     .serial_parity = RIG_PARITY_NONE,