Specifications

BayTech Addendum Publication No. Z140A186

Reference BayTech Manual Publication No. U140E121-03 Page 3 of 10

4.2 DS73 and DS73TP CONNECTION

The DS73 and DS73TP module requires a physical network connection to perform PPP sessions with the network

host. The DS73 supports 10BASE2 or 10BASE-T Ethernet connections with Ethernet II or 802.3 SNAP framing. Use

the following procedure to access the DS73 modules through the DS-Series Host module:

1. Open a session to the DS73 module using any workstation TELNET client or ephemeral. You will be

presented with a welcome screen (if enabled) and a login prompt (if enabled) upon successful establishment

of the session similar to the following:

DS-Series DS73

Unit: 1 Module: 1

Bay Technical Associates

To login, enter password.

NOTE: You will not get the welcome message and/or the login prompt if either one of these options are

disabled in configuration mode (see Section 5.7 of this addendum).

2. Enter the password at the login prompt (if enabled).

3. If the login procedure is enabled, you will receive a "Login Successful" message and a prompt to enter a

selection if the password is successfully entered. At this point, you may configure modules, connect to

ports, receive messages, etc.. See Section 4.5 of this addendum for a summary of DS73 commands.

Refer to the Operator's Manual for operation information concerning the 4-port serial peripheral

communications modules DS74. The DS73 can route data from a peripheral communications module

operating in Immediate Message mode or Immediate Data mode to one and only one network workstation.

A network workstation must send a command to the DS73 module to receive messages or data. This

command consists of the port select code ($BT - default), capital "I", and Carriage Return or Line Feed.

For example, if using the default port select code, send $BTI<cr> where <cr> is Carriage Return. If a

workstation issues this command and another workstation is currently receiving immediate mode data, the

requesting workstation will receive the message "Immediate Mode in use".

The DS73 will send the message "Command/configuration mode in use" to a workstation that attempts to

access command mode of a module while another workstation is currently in command mode for that

module. The requesting workstation will not be able to place a module into command mode until the other

workstation either issues a disconnect command ($BT<cr>) or makes a connection to a specific peripheral

communications port. See Section 4.6 of this addendum for a summary of the various DS73 messages.

4. A host connection to the DS73 is terminated by sending the port select code ($BT - default), capital "X",

and Carriage Return or Line Feed. For example, if using the default port select code, send $BTX<cr>

where <cr> is Carriage Return.

4.4 RESOURCE RELEASE FUNCTION

Circumstances may arise when it may be necessary to terminate a connection remotely without having to reset the

unit. For example, this situation will occur if a network user does not terminate a port connection to a DS74 port.

Connection termination may be accomplished using the Resource Release function. There are 3 specific methods to

accomplish this function. These are described below (assuming the default select code of "$BT" is used):

$BTRI<cr> Causes the Immediate Receive mode to be released.

$BTRC<cr> Causes the Command/Configuration mode to be released (except if user is connected to

the Service Port).

$BTRm,p<cr> Causes the module, port as specified by "m,p" to be released.

4.5 COMMANDS

The DS73 requires that certain commands be issued to make or break network connections or connections to

peripheral modules. These commands are summarized in the table below.