From 877446abc33564643dd909b7a1dadfb1cbd8a653 Mon Sep 17 00:00:00 2001
From: Michael <101.37584@germanynet.de>
Date: Tue, 17 Sep 2024 11:43:02 +0200
Subject: [PATCH 1/2] add section for Serial2

---
 docs/assets/images/Serial2-1.png  | Bin 0 -> 7567 bytes
 docs/assets/images/Serial2-2.png  | Bin 0 -> 8076 bytes
 docs/assets/images/Serial2-3.png  | Bin 0 -> 6016 bytes
 docs/software/serial-protocols.md |  42 +++++++++++++++++++++++++++++-
 4 files changed, 41 insertions(+), 1 deletion(-)
 create mode 100644 docs/assets/images/Serial2-1.png
 create mode 100644 docs/assets/images/Serial2-2.png
 create mode 100644 docs/assets/images/Serial2-3.png

diff --git a/docs/assets/images/Serial2-1.png b/docs/assets/images/Serial2-1.png
new file mode 100644
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diff --git a/docs/software/serial-protocols.md b/docs/software/serial-protocols.md
index b27ea42b8..9d3873934 100644
--- a/docs/software/serial-protocols.md
+++ b/docs/software/serial-protocols.md
@@ -14,6 +14,8 @@ ExpressLRS receivers can communicate using a variety of serial protocols:
 - SUMD
 - DJI RS2 Pro (Modified SBUS with pre-configured limits)
 - HoTT Telemetry
+- Tramp
+- SmartAudio
 
 ## Receiver Protocol Selection
 
@@ -59,6 +61,43 @@ When connected to the receiver with the transmitter, enter the ExpressLRS Lua sc
 ![output mapping serial](../assets/screenshots/receiver-serial.png)
 </figure>
 
+## Second Serial Interface on ESP32 PWM receivers
+
+Starting with firmware version 3.5 an additional serial interface (Serial2) can be assigned on any featured PWM Output to run any of the available serial protocols. Both serial interfaces can be be utilized at the same. This enables setups like running a CRSF wing stabilization unit and HoTT telemetry, Tramp or SmartAudio at the same time. Serial2 can also be utilized to simplify the wiring of e.g. an SBUS connection on receivers which have the first serial interface on separate connectors (e.g. RM receivers with JST connectors).
+
+### Assigning Serial2 TX vs Serial2 RX and Serial2 TX
+
+Most of the supported serial protocols are uni-directional (only sending data) or are bi-directional (sending and receiving data) on one single wire (half duplex). For those protocols it is only necessary to assign a TX pin. True (full duplex) serial protocols require the assignment of RX and TX. The following list shows the configuration requirements for the supported protocols:
+
+CRSF and MAVLINK: require Serial2 TX and additionally Serial2 RX if the device returns data (e.g. telemetry) 
+all others: require Serial2 TX only
+
+### Configuring Serial2
+
+Serial2 is best configured using the WebUI but can also be configured using the LUA script.
+
+Open the WebUI as described in section "How to get to the Web UI" and scroll down to the PWM Output table. Any PWM Output with the blue Serial2 feature tag can be used to assign Serial2 TX or Serial2 RX. 
+
+<figure markdown>
+![Feature Flags](../assets/images/Serial2-1.png)
+</figure>
+
+Assign Serial2 TX. If necessary for the serial protocol you intend to run assign Serial2 RX also. In this example we want to run a protocol that only requires Serial2 TX (see above section). Choose Serial2 TX using the Mode drop down list on the desired PWM Output.
+
+<figure markdown>
+![Mode selection](../assets/images/Serial2-2.png)
+</figure>
+
+Scroll down a little further. A new line named Serial2 protocol is now available to choose the desired protocol.
+
+<figure markdown>
+![Serial2 Protocol](../assets/images/Serial2-3.png)
+</figure>
+
+Save the configuration using the SAVE button at the bottom of the page.
+
+Restart the receiver and connect your serial device to the configured PWM Output.
+
 ## SUMD Notes
 
 SUMD is the Graupner HoTT bus protocol used to transmit multiple channel data over a single serial line. It transports up to 16 full res channels at a rate of 100Hz and is mainly used to provide digital channel data to Flybarless Control Systems for helicopters and older Flight Controllers.
@@ -170,12 +209,13 @@ If an adapter cable is required depends on the platform the receiver is based on
 
 ESP32 based receivers with Serial on dedicated PWM servo connectors like the BetaFPV SuperP 14ch:
 
-- No adapter cable is required. HoTT sensors can be directly connected to the PWM servo connector dedicated for Serial TX.
+- No adapter cable is required. HoTT sensors can be directly connected to the PWM servo connector dedicated for Serial TX any of the PWM pins configured for Serial2 (see above section).
 
 ESP32 based receivers with Serial on the JST connector.
 
 - RadioMaster ER6x/ER8x need a JST to JR adapter. The JST pigtail RadioMaster included in the package can be used.
 - Caveat: the SuperP 14ch also has a JST connector but it can't be used as a Serial port, see the first ESP32 category.
+- Alternatively use any of the PWM pins configured for Serial2 (see above section 2).
 
 <figure markdown>
 ![RM ER6 and ER8](../assets/images/HoTT-TLM-P5.png)

From 5930bdc53e9fcbebdf8d59338504d720aa32a5fc Mon Sep 17 00:00:00 2001
From: Michael <101.37584@germanynet.de>
Date: Thu, 19 Sep 2024 12:57:17 +0200
Subject: [PATCH 2/2] included @deadbyte's review comments

---
 docs/software/serial-protocols.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/docs/software/serial-protocols.md b/docs/software/serial-protocols.md
index 9d3873934..6f6287795 100644
--- a/docs/software/serial-protocols.md
+++ b/docs/software/serial-protocols.md
@@ -63,14 +63,14 @@ When connected to the receiver with the transmitter, enter the ExpressLRS Lua sc
 
 ## Second Serial Interface on ESP32 PWM receivers
 
-Starting with firmware version 3.5 an additional serial interface (Serial2) can be assigned on any featured PWM Output to run any of the available serial protocols. Both serial interfaces can be be utilized at the same. This enables setups like running a CRSF wing stabilization unit and HoTT telemetry, Tramp or SmartAudio at the same time. Serial2 can also be utilized to simplify the wiring of e.g. an SBUS connection on receivers which have the first serial interface on separate connectors (e.g. RM receivers with JST connectors).
+Starting with firmware version 3.5 an additional serial interface (Serial2) can be assigned on any featured PWM Output to run any of the available serial protocols. Both serial interfaces can be be used simultaneously. This enables setups like running a CRSF wing stabilization unit and HoTT telemetry, Tramp or SmartAudio at the same time. Serial2 can also be used to simplify the wiring of e.g. an SBUS connection on receivers which have the first serial interface on separate connectors (e.g. RM receivers with JST connectors).
 
 ### Assigning Serial2 TX vs Serial2 RX and Serial2 TX
 
 Most of the supported serial protocols are uni-directional (only sending data) or are bi-directional (sending and receiving data) on one single wire (half duplex). For those protocols it is only necessary to assign a TX pin. True (full duplex) serial protocols require the assignment of RX and TX. The following list shows the configuration requirements for the supported protocols:
 
-CRSF and MAVLINK: require Serial2 TX and additionally Serial2 RX if the device returns data (e.g. telemetry) 
-all others: require Serial2 TX only
+- CRSF and MAVLINK: require Serial2 TX and additionally Serial2 RX if the device returns data (e.g. telemetry) 
+- all others: require Serial2 TX only
 
 ### Configuring Serial2
 
@@ -209,7 +209,7 @@ If an adapter cable is required depends on the platform the receiver is based on
 
 ESP32 based receivers with Serial on dedicated PWM servo connectors like the BetaFPV SuperP 14ch:
 
-- No adapter cable is required. HoTT sensors can be directly connected to the PWM servo connector dedicated for Serial TX any of the PWM pins configured for Serial2 (see above section).
+- No adapter cable is required. HoTT sensors can be directly connected to the PWM servo connector of any of the PWM pins configured for Serial2 TX (see above section).
 
 ESP32 based receivers with Serial on the JST connector.