update tx-500 page

content/equipment/transceivers/lab599-tx500/index.md

@@ -37,7 +37,8 @@ I bought a Laravel mic from Amazon and I already got a spare in-ear plugs from S
 which I combined with the [adapters from Robert W2ENY](https://w2eny.com/tx500/) (including
 a hand-held push-to-talk button adapter (like the Heil HS-2 but smaller).
 
-This is pleasing to use and you got the sound directly in-ear.
+This is pleasing to use and you got the sound directly in-ear. Though, the Laravel mic has
+no punch and I'm not using this for the moment.
 
 ## Original CAT cable settings
 
@@ -49,6 +50,23 @@ This is pleasing to use and you got the sound directly in-ear.
 | Parity    | NONE    |
 | Stop bits | 1       |
 
+Firmware version 1.19.01 or later includes a second CAT protocol named Lab599 which adds
+support for DIG mode switching commands (MD6). It uses the same settings as the KENWOOD mode.
+
+I use these rigctld commands:
+
+### KENWOOD mode
+
+~~~console
+$ rigctld -m 2014 -r /dev/ttyUSB0 -d /dev/ttyUSB0 -p /dev/ttyUSB0 -P RTS -s 9600 -vvvv
+~~~
+
+### Lab599 mode
+
+~~~console
+$ rigctld -m 2050 -r /dev/ttyUSB0 -d /dev/ttyUSB0 -p /dev/ttyUSB0 -P RTS -s 9600 -vvvv
+~~~
+
 ## Power output at 10%
 
 Since someone asked on a mailing list to verify his measurements
@@ -70,3 +88,10 @@ As always, take these with a grain of salt!
 | 10m  | 29.080 MHz | NORMAL        |  1.7 W | 2.86 W |
 |      |            | DUAL          |  1.5 W | 0.90 W |
 
+## PA500
+
+Since the TX-500 does not have a built-in tuner the PA500 is well
+worth the investment. It got it's
+[own page]({{< ref "/equipment/accessories/diy599-pa500/" >}})
+in my equipment collecion.
+