diff --git a/prj.conf b/prj.conf
index 1e1c4c8..8f9f546 100644
--- a/prj.conf
+++ b/prj.conf
@@ -12,6 +12,7 @@ CONFIG_BT_GATT_CLIENT=y
 
 CONFIG_MODBUS=y
 CONFIG_MODBUS_ROLE_CLIENT=y
+CONFIG_MODBUS_FP_EXTENSIONS=n
 
 CONFIG_DEBUG_THREAD_INFO=y
 CONFIG_EXTRA_EXCEPTION_INFO=y
diff --git a/src/main.cpp b/src/main.cpp
index bccac1a..ac4f341 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -78,6 +78,7 @@ void display_thread(void*,void*,void*)
 		{
 			auto l = display.lock();
 			display.print_chr(0,0,spinner[spinner_idx++]);
+			display.print_str(16,0,cached.on ? " ON":"OFF");
 			char buff[13];
 			snprintf(buff,13,"Bat %6.2u%%",cached.b_soc);
 			display.print_str(0,16,buff);
@@ -140,9 +141,17 @@ int main(void)
 		if(modbus_read_input_regs(client_iface, 1, 0x3045, holding_reg,
 			       ARRAY_SIZE(holding_reg))!=0)
 		{
-			printt("Read fail");
+			printt("Read fail1");
 			continue;
 		}
+
+		uint16_t onoff;
+		if(modbus_read_holding_regs(client_iface, 1, 0x902C, &onoff,1)!=0)
+		{
+			printt("Read fail3");
+			continue;
+		}
+		printt("%d", onoff);
 		k_mutex_lock(&reg_data.mut, K_FOREVER);
 		reg_data.d.b_soc = holding_reg[0];
 		reg_data.d.b_v = holding_reg[1];
@@ -151,6 +160,7 @@ int main(void)
 		reg_data.d.l_a = holding_reg[6];
 		reg_data.d.s_v = holding_reg[9];
 		reg_data.d.s_a = holding_reg[10];
+		reg_data.d.on = onoff == 0;
 		k_mutex_unlock(&reg_data.mut);
 		k_sem_give(&reg_data.new_sample);
 		printt("Read ok");
diff --git a/src/main_modules.hpp b/src/main_modules.hpp
index 386d024..9a0c262 100644
--- a/src/main_modules.hpp
+++ b/src/main_modules.hpp
@@ -23,6 +23,7 @@ struct Reg_data {
 	uint16_t l_a;
 	uint16_t s_v;
 	uint16_t s_a;
+	bool on;
 	} d;
 	k_mutex mut;
 	k_sem new_sample;