ETC 15-82-1175

MODEL 65200-100
Compact Single In-Line module (SIM) form factor
Host-independent design opens the LonTalk protocol to any host with a standard EIA-232C serial interface
Transceiver-independent design connects to any LONWORKS channel with a transceiver interface rate from
9.8kbps to 1.25Mbps
Application-independent design can be used with any host application
1200 to 115,200bps serial bit rate to the host with optional autobaud detection sends and receives up to 77
packets per second
Connection to remote hosts using modems conforming to the Hayes AT-command set
Optional password protection prevents unauthorized access from remote hosts
4Kbyte RAM with 3Kbytes available for buffers
10MHz input clock
ANSI C source code for a network interface library and sample host application
Network driver for DOS and source code for sample network drivers for DOS and UNIX available
The LTS-10 Serial Adapter Core Module is a compact module used by OEMs to build serial LonTalk adapters (SLTAs).
A serial adapter is a device that enables any host processor with an EIA-232C (formerly RS-232C) serial interface to
implement LONWORKS applications and to communicate with other devices using the LonTalk protocol. The host
processor may be directly connected to the serial adapter or may be connected over a telephone line using a pair of
A serial adapter allows any host to implement the upper layers of the LonTalk protocol, so applications on the host
can send and receive network variable updates and explicit messages, as well as poll network variables. This
capability extends the reach of LONWORKS technology to a variety of hosts including desktop, laptop, and palmtop
PCs, workstations, embedded microprocessors, and microcontrollers.
Typical applications for the LTS-10 module include monitoring and control nodes based on microcontrollers or
computers such as IBM PC compatibles, Sun workstations, or VME-based computers.
The LTS-10 consists of the core electronics and firmware in a compact single in-line module (SIM) form factor.
Vertical SIM sockets are available to minimize footprint; right-angle SIM sockets are also available to minimize
component height.
The LTS-10 module comes preconfigured with many common LONWORKS transceiver parameters. Five transceiver
identification (XID) pins on the LTS-10 module select the appropriate transceiver type for the SLTA. The transceiver
ID inputs simplify the host software by automatically configuring the LTS-10 module for most transceivers. A special
transceiver ID is reserved for programming any custom transceiver parameters.
The LTS-10 module has a fixed input clock rate of 10MHz. The module can be used with transceivers running at
interface rates from 9.8kbps to 1.25Mbps.
When used with a modem, a serial adapter can be used to implement applications with a host computer that is located
remotely from the LONWORKS network. Any node can initiate a call to the remote host. Therefore, a node detecting
an alarm condition can dial out to a remote host to inform the host of the condition. The modem can also be set up
for automatic answer mode so that a remote host can dial into a LONWORKS network for remote network monitoring
and control.
The LTS-10 module includes a Neuron 3150 Chip, high-speed UART, PROM with high-performance firmware, and a
3KByte buffer RAM using a 2KByte external RAM and 1KByte of the Neuron Chip RAM.
Nodes using an LTS-10 separate LonTalk protocol processing between the host processor and the serial adapter. The
serial adapter handles layers 1 through 5 of the LonTalk protocol. This significantly reduces overhead in the host
processor since it does not have to deal with lower layer network services such as media access control, collision
avoidance, acknowledgments, retries, duplicate message detection, message validation, authentication, and priority
processing. The host processor is left to run the application program and handle the layer 6 and 7 protocol services,
i.e. network variable processing and explicit message processing. The host can easily send and receive network
variable updates and explicit messages through these services.
Separating the upper two layers of the LonTalk protocol from the lower five layers has the added benefit of making a
serial adapter independent of its host application. The host application and its network variable can be changed at
any time without modifying the adapter. This lowers development and maintenance costs since a serial adapter does
not have to be tailored to an application.
Nodes based on an LTS-10 can have to up to 4096 network variables, each potentially connecting to 32,000 network
variables on other nodes. This limit is higher than the Neuron Chip-hosted node limit of 62 bound network variables
because the network variable configuration is managed by the host instead of the Neuron Chip inside the serial
adapter. The use of bound network variables reduces network loading and increases system capacity by allowing
values to be updated over the network only when necessary without the need for constant polling.
A serial adapter implemented with an LTS-10 module can be used with a pair of modems to provide remote access to a
LONWORKS network. As illustrated in the following figure, the local SLTA is connected to the LONWORKS network
and a local modem while the remote host is connected to a remote modem.
Node 1
Node 2
Transceiver Interface
Node 3
Node 4
An adapter implemented with the LTS-10 module supports the LonTalk network management messages for controlling
an attached modem. Any node can initiate an outgoing call to a remote host by sending network management dialing
messages to the adapter. Network management messages can be used to define a dialing directory stored in the
adapter, enabling application nodes to dial out to remote hosts without requiring host phone numbers to be
maintained in every node.
Any node, including the host, can use network management messages to configure the adapter to automatically
answer incoming calls to permit remote hosts to monitor or controlthe network at any time. Any node can use
network management messages to install a password in the adapter so that a remote host must enter the password
before accessing any nodes on the network.
The LTS-10 can be used with any modem recognizing the Hayes AT-command set. Compatible modems are readily
available worldwide, making the LTS-10 a universal solution for remote access to LONWORKS networks.
The LTS-10 module does not have the network services interface (NSI) functionality required for use with the NSS for
Windows network services server, preventing LNS-based network management applications from using the LTS-10
module. Thus, the primary use of a LTS-10 module in a network installed with a tool based on the LNS Developer’s
Kit for Windows is to create a microprocessor-hosted node with up to 4096 network variables, instead of the 64
network variables allowed a Neuron Chip-hosted node. The microprocessor may be any processor with an EIA-232C
(formerly RS-232C) serial interface, such as Sun workstations or VWE-based computers.
The LTS-10 can be used with legacy applications such as the LonManager LonMaker installation tool, the LonManager
DDE Server, and applications based on the LonManger API for DOS or the LonManager API for Windows.
A complete serial adapter requires an LTS-10 SLTA Core Module, LonTalk transceiver, EIA-232 driver/receiver, and a
motherboard with power supply. The LTS-10 module is compatible with all LONWORKS transceivers with interface
rates of 9.8kbps or higher including standard transceivers for twisted pair, link power, and power line.
The following figure is a block diagram of a node based on the LTS-10 module.
Host-Based Node with LTS-10
Host Application
(monitoring, control, or communication)
Serial Adapter
EIA-232 Serial Interface
EIA-232 Driver/Receivers
Neuron 3150
LonTalk Transceiver Interface
A simple network driver is implemented on the host processor to manage the interface with the serial adapter. This
allows the same host application to be used with multiple network interfaces, preserving any investment in host
application development. Complete specifications for the network driver are included in the Serial LonTalk Adapter
and Serial Gateway User’s Guide. Complete source code for DOS and UNIX network drivers that can be used as the
basis for a network driver for any host is provided with the Connectivity Starter Kit.
A sample host application is also provided with the Connectivity Starter Kit. This application illustrates how a host
application can send and receive network variables and explicit messages using the network driver. The sample
application demonstrates how a host application can implement network variables and respond correctly to network
management messages for binding those network variables.
The sample host application also includes source code for a network interface library that simplifies the use of any
LONWORKS network interface, including an adapter based on the LTS-10 module. The library includes function calls
to initialize and reset the network interface; send, receive, and respond to LonTalk messages; and handle errors.
LonTalk messages may include network variable updates and polls, as well as explicit messages. For example, to send
a network variable the host application initializes a buffer that contains the network variable selector and the new
value for the network variable and then calls the ni_send_msg_wait() function in the network interface library.
The following figure illustrates the application buffer format for network variable updates and explicit messages.
size = 2 bytes
size = 2 bytes
size = 3
size = 3
size = 11
size = 11
Network Variable
Selector size = 2
Message Code
size = 1
Network Variable
Value, Size Varies
Explicit Message
Data, Size Varies
Network Variable
Update Buffer
Explicit Message
Update Buffer
Part Number
SIMM Socket:
40-position vertical 50mil pitch
40-position right angle 50mil pitch
15-82-1175 or 15-82-0793
1-byte data
8-byte data
32-byte data
228-byte data
71 packets/sec (571bps)
71 packets/sec (4,571bps)
56 packets/sec (14,222bps)
22 packets/sec (39,652bps)
1-byte data
8-byte data
32-byte data
228-byte data
77 packets/sec (615bps)
71 packets/sec (4,571bps)
59 packets/sec (15,059bps)
22 packets/sec (40,533bps)
with Modem
5 - 10 packets/sec depending on type of service
Note: PC/386 host, 25MHz; TP/XF-1250 transceiver, 115,200bps EIA-232 interface; protocol overhead of 9 bytes per
Network Interface Commands
Network Interface Responses
Network Management Commands
Network Driver Commands
Network Interface Library Functions
Processor Input Clock
Serial Communications Type
Serial Bit Rate
Serial Modem Control
SIM Connector
Operating Input Voltage
Operating Input Current
Non-operating (12 hour)
Humidity (non-condensing)
Non-operating (12 hour)
EMI Compliance
Buffer Request
Send Message
Local Network Management Command
Flush and Flush Cancel
Online and Offline
Source Quench and Resume
Buffer Grant
Incoming Message
Incoming Response
Completion Event
Flush Complete
Send Modem String
Modem Status Readback
Modem Response Query
Connection Status Query
Install Directory Entry
Dial From Directory
Hang Up
Install Password
Install Start-Up Configuration String
Install Dial Prefix
Install Hang-Up String
Install Hang-Up Timer
Open Network Interface
Read and Write Buffer
I/O Control
Register Callback Function
Close Network Interface
Initialize Network Interface
Reset Network Interface
Send LonTalk Message and Wait for Completion
Get Next Response
Receive LonTalk Message
Send LonTalk Response
Local Network Management Command
Handle Error
Neuron 3150 Chip
10 MHz
EIA-232, TTL signal levels
1200, 2400, 9600, 14.4k, 19.2k, 38.4k, 57.6k, or 115.2kbps
Optional RTS, CTS, DSR, DCD, DTR, and RI
40-position SIMM or SIMM II 0.050” centerline single row connector,
vertical or right angle
+5VDC ±10%
150mA max
-40 to +85°C (revision G or higher)
-45 to +85°C
10 to 95%RH @85°C (revision G or higher)
95%RH max @85°C
67mm x 27mm x 7mm
(2.65” x 1.06” x 0.3”)
Designed to comply with Part 15 Level B
Designed to comply with 0871 Level B
The following documentation is included with the Connectivity Starter Kit. The documentation describes how to
build a serial adapter using the LTS-10 module, how to install the adapter, and how create a host application that uses
the adapter as a network interface.
Document & Echelon Model Number
LONWORKS Host Application Programmer’s Guide
Serial LonTalk Adapter and Serial Gateway User’s Guide
The Connectivity Starter Kit should be ordered with the initial LTS-10 module. This kit includes the LTS-10 module
documentation and software, in addition to a SIM socket for prototyping.
Product & Echelon Model Number
LTS-10 Serial Adapter Core Module
Connectivity Starter Kit
Echelon Corporation assumes no responsibility for any errors contained herein. No part of this document may be reproduced, translated, or
transmitted in any form without permission from Echelon.
© 1995-1997 Echelon Corporation.
Echelon, LON, LONWORKS, LONMARK, LonBuilder, LonManager, LonTalk, LonUsers, Neuron 3120, Neuron 3150, NodeBuilder the LonUsers
Logo, and the Echelon Logo are trademarks of the Echelon Corporation registered in the United States and other countries. LonResponse,
LonSupport, and LonMaker are trademarks of the Echelon Corporation. Other product names may be trademarks of their respective companies.