diff --git a/bacnet-stack/config.h b/bacnet-stack/config.h
index 4cb16690..1c0233f3 100644
--- a/bacnet-stack/config.h
+++ b/bacnet-stack/config.h
@@ -12,8 +12,8 @@
 /* This is used in constructing messages and to tell others our limits */
 /* 50 is the minimum; adjust to your memory and physical layer constraints */
 /* Lon=206, MS/TP=480, ARCNET=480, Ethernet=1476 */
-/* #define MAX_APDU 50 */
-#define MAX_APDU 480
+#define MAX_APDU 50
+/* #define MAX_APDU 480 */
 /* #define MAX_APDU 1476 */
 
 /* for confirmed messages, this is the number of transactions */
diff --git a/bacnet-stack/demo/object/lc.ide b/bacnet-stack/demo/object/lc.ide
index 59b0bcbb..3b03717d 100644
Binary files a/bacnet-stack/demo/object/lc.ide and b/bacnet-stack/demo/object/lc.ide differ
diff --git a/bacnet-stack/ports/pic18/readme.txt b/bacnet-stack/ports/pic18/readme.txt
index 184eea76..3b024559 100644
--- a/bacnet-stack/ports/pic18/readme.txt
+++ b/bacnet-stack/ports/pic18/readme.txt
@@ -6,13 +6,16 @@ the BACnet Stack using MPLAB IDE and MCC18 Compiler,
 
 1. Add the files to the project that you need:
 abort.c, apdu.c, bacapp.c, bacdcode.c, bacerror.c,
-bacstr.c, bigend.c, crc.c, datalink.c, dcc.c, dlmstp.c,
-ima.c, mstp.c, npdu.c, rd.c, reject.c, reject.c,
-ringbuf.c, rp.c, whois.c, wp.c
+bacstr.c, crc.c, datetime.c, dcc.c, iam.c, 
+npdu.c, rd.c, reject.c, rp.c, whois.c, wp.c
 
-From demo/object/: device.c or dev_tiny.c, ai.c, ao.c, etc.
+From ports/picxx: isr.c, main.c, rs485.c, mstp.c, dlmstp.c
 
-From demo/handler/: h_dcc.c, h_rd.c, h_rp.c, h_wp.c
+From demo/object/: device.c or dev_tiny.c
+objects as needed: ai.c, ao.c, etc.
+
+From demo/handler/:  txbuf.c, h_dcc.c, h_rd.c, h_rp.c or h_rp_tiny.c
+Additional handlers as needed: h_wp.c
 
 2. Project->Options->Project
 
@@ -27,4 +30,15 @@ Stack: Multi-bank Model
 MPLAB C18 Tab: General: Macro Definitions:
 PRINT_ENABLED=0
 BACDL_MSTP=1
+TSN_ENABLED=0
 BIG_ENDIAN=0
+
+3. The linker script must reserve some extra stack space.
+
+//DATABANK   NAME=gpr12      START=0xC00          END=0xCFF
+//DATABANK   NAME=gpr13      START=0xD00          END=0xDFF
+DATABANK   NAME=stackreg   START=0xC00          END=0xDFF          PROTECTED
+
+//STACK SIZE=0x100 RAM=gpr13
+STACK SIZE=0x200 RAM=stackreg
+
diff --git a/bacnet-stack/ports/pic18f6720/BACnet-Server.mcw b/bacnet-stack/ports/pic18f6720/BACnet-Server.mcw
index 825a749e..05ae9cde 100644
Binary files a/bacnet-stack/ports/pic18f6720/BACnet-Server.mcw and b/bacnet-stack/ports/pic18f6720/BACnet-Server.mcw differ