BayTech DS Series User manual

DS Series Manual
DATA SWITCH
DS71-MD4 Host-Modem Module
BayTech Manual Publication
Revision May 2008

Copyright 2007 by Bay Technical Associates, Inc.
BayTech, is a registered trademarks of Bay Technical Associates, Inc.
Windows 2000®, Windows XP® are products and registered trademark of Microsoft Corporation.
Tera Term is a product and registered trademark of Vector, Inc.

DS71-MD4 Serial host and 56k Modem
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ABOUT THIS OWNER’S MANUAL..........................................................................................................4
Connection Description.........................................................................................................................4
EIA-232 SERIAL CONNECTION.......................................................................................................5
Internal MODEM CONNECTION.......................................................................................................5
External Modem Connection.............................................................................................................5
Installation.................................................................................................................................................5
Power....................................................................................................................................................6
QUICK START: DS71-MD4 Module.........................................................................................................6
Serial Setup...........................................................................................................................................6
Main Menu ............................................................................................................................................7
Login Setup .......................................................................................................................................8
Local Modem Option .......................................................................................................................10
Cabling ...................................................................................................................................................10
RJ-45 Cables and Adapters................................................................................................................10
Adapters..............................................................................................................................................11
Detailed Operation and Configuration ....................................................................................................13
DS71-MD4 Main Menu........................................................................................................................13
Configuration Menu.............................................................................................................................13
Host Module Configuration..............................................................................................................13
Configuration Status ....................................................................................................................14
Serial Port Configuration..............................................................................................................16
Port Device Name........................................................................................................................18
Port Select Code..........................................................................................................................18
Attention Character......................................................................................................................18
Disconnect Timeguard.................................................................................................................19
Connect port ID Echo...................................................................................................................19
Login Setup..................................................................................................................................19
Header......................................................................................................................................20
Access Control.........................................................................................................................20
Menu ........................................................................................................................................20
Manage Users..........................................................................................................................20
Auto Connect............................................................................................................................22
Dial-Back Number....................................................................................................................22
Assign User Ports.....................................................................................................................23
Local Modem Option....................................................................................................................24
Ring to Answer.........................................................................................................................24
Connectivity Timeout................................................................................................................24
Inactivity Timeout .....................................................................................................................24
Unit ID..........................................................................................................................................25
I/O modules Reset ..............................................................................................................................25
Unit Reset ...........................................................................................................................................25
Troubleshooting:.....................................................................................................................................25
Functional Solutions:...........................................................................................................................25
DS71-MD4 Reset Procedure ..............................................................................................................27
BayTech Product Warranty.....................................................................................................................27
Technical Support...............................................................................................................................28
Return Authorization Process: ............................................................................................................29

DS71-MD4 Serial host and 56k Modem
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ABOUT THIS OWNER’S MANUAL
This document provides information required for installing and operating your Bay Tech equipment. It
should allow the user to connect to, power up, and access an applications menu where peripheral
equipment can be controlled. We recommend reading this manual carefully, while placing special
emphasis on correct cabling and configuration. If you have any problems with your installation, please
contact BayTech’s Technical Support at 228-563-7334, call toll free from anywhere in the United States
using 1-800-523-2702 or contact us at our Web Site, www.baytech.net.
BayTech manufactures many remote site management products, data switches, data collection
multiplexers, and remote power controllers. If you would like information on any of these products,
please contact BayTech Customer Service at the above numbers or visit our web site.
Conventions used in this manual include:
•CAUTION: This term is used to denote any condition that could possibly result in physical
harm to personnel or damage to equipment.
•IMPORTANT: This term is used to denote conditions that could result in the loss of
communications or to highlight the proper functioning of equipment.
•NOTE: This term is used to denote items of interest to the user.
•<cr>: Carriage Return or ENTER
The information in this document is subject to change without notice. The statements, configurations,
technical data, and recommendations in this document are believed to be accurate and reliable, but are
presented without express or implied warranty. Users must take full responsibility for their applications
of any products specified in this document. The information in this document is proprietary to Bay
Technical Associates, Inc.
In the interest of improving internal design, operational function, and/or reliability, Bay Technical
Associates, Inc reserves the right to make changes to the products described in this document without
notice.
Bay Technical Associates, Inc does not assume any liability that may occur due to the use or application
of the product(s) or circuit layout(s) described herein.
BayTech units are in accordance with the general requirements of Standard for Information Technology
Equipment (ETL listed, conforms to ANSI/UL STD 60950-1-2003 CERTIFIED CAN/CSA C22.2 NO.
60950-1-03, UL STD 231 8TH EDITION, UL STD 1950 3RD EDITION CERTIFIED CAN/CSA 22.2
NO. 950-95, CE conforms to IEC 60950-1).
We welcome any comments you may have about our products, and we hope that you will continue to
look to BayTech for your data communication needs.
Connection Description
BayTech's DS71-MD4 host communication modem module provides an interface that controls user
access to the DS Series data switch and other DS Series connected modules. The DS71-MD4 is a system
data controller that directs operations between the base unit, system modules and externally connected
devices.

DS71-MD4 Serial host and 56k Modem
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EIA-232 SERIAL CONNECTION
The DS-Series host communications modules have an RJ-45 port which uses an 8-pin crossed modular
cable to connect to a local EIA-232 device such as a computer terminal or external modem. Most serial
computers do not have RJ-45 connections; therefore an adapter is provided with this unit to convert from
a DE-9 connector to an RJ-45 connector (Bay Tech Part No. 9FRJ45PC-4). An adapter to convert from a
DB-25 connector to an RJ-45 connector is also available from Bay Tech, upon request (Bay Tech Part
No. 25FRJ45PC-4). The 8-pin crossed modular cable is configured to operate with these adapters.
Configure serial communications parameters for the host terminal to match the DS71-MD4 module. The
modules have factory serial communications parameters of 9600 bps, 8 data bits, 1 stop bit, no parity,
XON/XOFF disabled.
Internal MODEM CONNECTION
The DS71-MD4 Host Communications Module has a Flash upgradeable 56 Kbps (V.90bis) modem
which allows two RJ-11 ports connected to standard dial-up telephone lines to be used between the Data
Switch unit and the user's Telco wall jack using a standard RJ-11 straight through cable. These ports are
in parallel and the second port is available for another Telco device using communications software, dial
the modem using the ATDT command.
IMPORTANT: The DS71-MD4 modem option has priority over the EIA-232 serial port. If a serial port
user is in configuration mode or connected to a DS74 I/O port when a modem connection is established,
the serial port user will be “booted” off, allowing the remote user to communicate with the DS unit.
External Modem Connection
Using the 25MRJ45MD-6 adapter (or other applicable adapter) and the RJ08X007 crossed cable,
connect the COM (or serial) port of the modem to the RJ-45 port labeled EIA-232 on the DS71-MD4
module. Using an RJ04X007 (RJ-11) modular cable, connect the port labeled “LINE” on the modem to
the Telco wall jack. The 25MRJ45MD-6 is not shipped with unit but is available upon request at time of
purchase.
Installation
UNPACKING
Compare the unit and serial number of the equipment you received to the packing slip located on the
outside of the box. Inspect equipment carefully for damage that may have occurred in shipment. If there
is damage to the equipment or if materials are missing, contact BayTech technical support at 228-563-
7334 or call toll free inside the United States at 800-523-2702. At a minimum, you should receive the
following:
1. The DS71-MD4 Module.
2. Manual insert describing the location of the User’s Guide on BayTech’s website at
www.baytech.net.
3. Power Cords that may be attached to the unit (if order requested detachable cords).
4. 1 ea. DE-9 (9 pin) PC com port adapter -- 9FRJ45PC (with Cisco Interface) or 9FRJ45PC-1.
5. 1 ea. RJ-45 Roll over cable -- RJ08X007.
NOTE: Keep the shipping container and packing material in the event future shipment is
required.

DS71-MD4 Serial host and 56k Modem
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Power
CAUTION: This unit is intended for indoor use only. Do not install near water or expose this unit to
moisture. To prevent heat buildup, do not coil the power cord when in use. Do not use extension cords.
Do not attempt to make any internal changes to the power source. Do not attempt to modify any portion
or component of a DS-Series Data Switch unless specifically directed to; as in Appendix E of this
manual. BayTech must perform any internal changes.
CAUTION: High-voltage surges and spikes can damage this equipment. To protect from such power
surges and spikes, this unit must have a good earth ground. A grounding screw connection is located
near the power switch on the back of the unit.
CAUTION: Before removing or replacing any modules, turn off main power switch located on the DS-
Series Base Unit. Communication to the DS-Series Data Switch will be disrupted while power is off.
QUICK START: DS71-MD4 Module
by Bay Technical Associates
For those Administrators who have requested the bare minimum for this type of equipment, follow these
steps exactly. If this is a new unit shipped directly from Baytech, follow the steps. If this is a previously
own unit, perform a factory reset to clear out any users and passwords still in the unit.
Serial/Modem Configuration:
1. Connect the 9FRJ45PC-4 or 9FRJ45PC-1 adapter to your PC.
2. Connect the supplied rollover flat cable RJ08X007 to the adapter and to the EIA232 serial port
on the Baytech DS71-MD4 Module.
3. Use terminal emulation software to access the unit, (i.e. Microsoft Hyper-terminal). Set the PC
serial port configuration to the following: 9600 bps, 8 data bits, 1stop bit and no parity.
4. If you get only a blinking cursor Press ‘Enter’. If still only a blinking cursor, Type 5 semi-colons
(;),The Attention Character will not echo on the screen. There is a one second delay before the
menu is displayed. You should see a menu similar to (Figure 1).
5. Select ‘C’ for the configuration menu.
6. Select the DS71-MD4 module. You should see a menu similar to (Figure 2).
7. Select the number for ‘Login Setup’ option. You should see a menu similar to (Figure 3).
8. Select the number for ‘Manage Users’ option. You should see a menu similar to (Figure 4).
9. NOTE: The ‘admin’ user can not be deleted.
10. Select ‘A’ to add user. Type the name and password at the prompts.
11. Press ‘Enter’ until get to the ‘Login Setup Menu’ (Figure 3).
12. Select option ‘Access Control’ to enable or disable the Modem and Serial Login Prompts.
13. Press ‘Enter’ until get to the ‘Login Setup Menu’ (Figure 3).
14. Select option ‘Assign User Ports’ (Figure 5).
15. Select the user and add the ports.
16. Press ‘Enter’ until you get the Configuration menu (Figure 2).
17. Select ‘Serial Port Configuration’ and set up the modem configuration.
At this point you have setup enough basic configurations to operate this Baytech unit.
Serial Setup
•Connect the 9FRJ45PC-4 adapter to the user’s computer

DS71-MD4 Serial host and 56k Modem
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•Connect the Host Module’s EIA-232 port to the adapter via the RJ08X007 rolled flat ribbon
cable.
•Default configuration is 9600 bps, 8 data bits, 1 stop bit and no parity.
NOTE: At any time during the session you need to go to another menu, use the Attention
Character = semi-colon (;). Press the attention character key 5 consecutive times to get back to the
main status menu.
NOTE: Depending on the DS-Series model, the menus will vary according to the number of DS74
modules installed in the unit. If this is not an initial set-up and Password has already been enabled,
you are prompted to login. After logging in successfully, invoke the main menu by sending the
attention character five times (;;;;;).
NOTE: Password feature is case sensitive. (Default is user/password is root/baytech)
Main Menu
The following Header and Menu appears or similar:
Figure 1
Select option ‘C’ for the configuration menu. Select the DS71-MD4 module option and the following
menu is displayed:
Data Switch Series - F.1.04.00
Bay Technical Associates
Unit ID: DS71-MD4
Attention Character: ;
Module 1: admin on Host EIA-232
Device A (3,1).................1
Device B (3,2).................2
Device C (3,3).................3
Device D (3,4).................4
DS-RPC (5,1).................5
Configuration .........................C
I/O Modules Reset .....................RM
Unit Reset ............................RU
Exit ..................................X
Logout ................................T
Enter Request :

DS71-MD4 Serial host and 56k Modem
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Figure 2
Login Setup
This menu allows the user to enable or disable the Header, Access Control, Menu, Manage Users, Auto
Connect, Dial Back Number, and Assign User Ports.
Figure 3
Header
This allows the admin to have enable or disable Header upon connection to the host module.
Access Control
This security feature allows the admin to enable or disable usernames and passwords for both serial and
modem port access.
Menu
This allows the admin to enable or disable the Menu on start up. The default user and password is
“admin/baytech”, all lower case.
Copyright(C) Bay Technical Associates 2006
DS71-MD4 Data Switch Series - V90 Modem Host Module
Revision F.1.01.01
Module 2
Status .........................1
Serial Port Configuration.......2
Port Device Name................3
Port Select Code................4
Attention Character.............5
Disconnect Timeguard............6
Connect port ID Echo ...........7
Login Setup ....................8
Local Modem Option .............9
Unit ID ........................U
Exit ........................X, CR
Enter Request :
Login Setup:
Header .......................1 Enable/Disable header for each menu
Access Control ...............2 Enable/Disable Network/Serial port user name
and password.
Menu .........................3 Enable menu on startup or 5 attention Char.
Manage Users .................4 Add/Delete users and change passwords.
Auto Connect .................5 Auto connect to module and port on power-up,
Has priority over setup menu, Disables the
menu selection screen on initial login.
Dial Back Number .............6 Have the modem to dial back the user
Assign User Ports ............7 Assign users to specific ports
Exit ......................X,CR Returns to previous menu
Enter Request :

DS71-MD4 Serial host and 56k Modem
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Manage Users
This option allows the administrator to change user passwords or add/delete new users. Up to 19 users
plus an administrator allowed. Usernames are case sensitive and alphanumeric.
Figure 4
Auto Connect
This feature allows the admin to select the module and port that the user will be automatically connected
on dial-in.
Dial-Back Number
This allows user to dial in, hang up and the unit dials the assigned number back when using a secure
phone line.
Assign User Ports
This option allows the administrator to limit users’ port access.
Figure 5
User Management Menu:
”admin” .............................. 1
Add New User ..........................A
Delete User ...........................D
Change User ...........................C
To change user password, enter number of user
Enter Request :1
Assigned User Ports:
+----+----------* +-M3-+-M4-+-M5-+
|User| Name \|1234|1234|1234|
+----+------------*----+----+----+
| 2 | johnt |x234|123x|1xx4|
+----+------------*----+----+----+
Add Port(s)............................1 Adds individual ports
Remove Ports(s)........................2 Removes individual ports
Add All Ports..........................3 Add All
Remove All Ports.......................4 Remove All
Exit ..................................X,CR
Enter Request :1

DS71-MD4 Serial host and 56k Modem
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Local Modem Option
Figure 5
Ring to Answer
This option sets the number of rings before the unit answers.
Connectivity Timeout
This option sets the continuous connectivity time (5 to 255 minutes) before the modem automatically
disconnects.
Inactivity Timeout
This option sets the time the modem will automatically disconnect, if there is no activity equaling the
programmed amount of time (1 to 120 minutes).
Cabling
RJ-45 Cables and Adapters
DS71-MD4 EIA-232 RJ-45 Signal
Pin EIA 232
Signal Signal Direction Description
1 DTR Out
Handshake, Line Driver Inactive State = High: +12V when power is
applied. Used as a handshake line to enable/disable the receiving of
characters.
2 GND Signal Ground
3 RTS Out
Handshake, Line Driver Inactive State = High: +12 V when power is
applied. Not used to enable/disable.
4 TX Out Transmit Data Out
5 RX In Receive Data In
6 DSR In
Handshake In. –12V when not used.
7 GND
Signal Ground, when Jumper JP6-2 is connected to JP6-3. In order for the
module to take advantage of “DCD Logon/Logoff” and “Auto Connect
Port”, Jumper JP6-2 is connected to JP6-1 providing DCD In.
8 CTS In
Used as a handshake line to enable/disable the receiving of characters.
Local Modem Option:
Rings to Answer ....................1 Auto-answer 1-4, Default 2
Connectivity Timeout ...............2 5-255 minutes, Default 60 minutes
Inactivity Timeout .................3 1-120 minutes, Default 0
Exit ...........................X, CR
Enter Request :

DS71-MD4 Serial host and 56k Modem
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Adapters Signals
Listed are the pin specifications for the BayTech cable and adapters and the terminal COM ports:
Signal RS-232
Port (DS) RS-232 Port (RPC) COM Port DE-9 Pin COM Port DB-25 Pin Signal
DTR 1 1 4 20 DSR
GND 2 2 1 GND
RTS 3 3 7 5 CTS
TXD 4 4 3 2 RXD
RXD 5 5 2 3 TXD
DSR 6 N/C 6 6 DTR
GND 7 7 5 7 GND
CTS 8 8 4 RTS
DTR 4 DCD
DCD 8 1 8 DTR
RI 9 22
Adapters
9FRJ45PC (With Cisco Interface) 9FRJ45PC-1 (Without Cisco Interface)

DS71-MD4 Serial host and 56k Modem
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RJ08X007
Figures 1 and 2 provide visual representation of an RJ-45 receptacle and plug.

DS71-MD4 Serial host and 56k Modem
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Detailed Operation and Configuration
DS71-MD4 Main Menu
The menu may vary according to the number of DS74 modules installed in the unit. With a proper
connection to the unit upon power-up or unit reset, the following menu is displayed:
NOTE: Only the Admin user will see the Configuration, Unit Reset, and I/O Module Reset
options. All users will see only the ports assigned to them, alone with ‘Exit’ and ‘Logout’.
Configuration Menu
The configuration menu allows the admin user to choose a module to access and edit its configuration.
The following pages define each line of the configuration menu. Changes take effect immediately.
Host Module Configuration
Enter the number that corresponds with the Host Module followed by a <cr> and the Host Module
responds without the option description:
Module 2: admin on Host EIA-232
Device A (2,1).........1
Device B (2,2).........2
Device C (2,3).........3
Device D (2,4).........4
DS-RPC (5,1).........5
Configuration .................C Module setup
I/O Modules Reset ............RM Reset all I/O ports
Unit Reset ...................RU Resets DS-unit. All internal and external
communications are lost
Exit ..........................X Access to additional menu options
Logout ........................T Logout the user
Enter Request :c
Module Configuration
DS71-MD4 (2)..........1 Host Module
DS74 (3)..........2 I/O EIA232 ports
DS-RPC (5)..........3 Assign users, outlet name, Enable/Disable
confirmation/status menu, unit id, alarm set
Exit......................X,CR
Enter Request :

DS71-MD4 Serial host and 56k Modem
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Configuration Status
The Status menu displays the modules installed and the current configuration of the host module. The
following are the factory default settings:
Copyright(C) Bay Technical Associates 2006
DS71-MD4 Data Switch Series - V90 Modem Host Module
Revision F.1.01.01
Module 2
Status .........................1 Current status of DS71-MD4 module
Serial Port Configuration.......2 Change port config, 9600, 8, 1, none
Port Device Name................3 Change the name of the device
Port Select Code................4 Non-Menu, ASCII code to select DS74 port
Attention Character.............5 (;;;;;) get Main Menu
Disconnect Timeguard............6 Delay to see if more data after ‘;’ char
Connect port ID Echo ...........7 Enable echo module & port#, device name
Login Setup ....................8 Mange user, Port, Header
Local Modem Option .............9 MD4 options
Unit ID ........................U Name the module
Exit ........................X,CR Return to previous menu

DS71-MD4 Serial host and 56k Modem
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Installed Modules :2,3,5
Port Select Code ......................$BT
Attention Character ...................;
Disconnect Time Guard .................Disabled
Port ID Echo ..........................Disabled
Unit ID ...............................DS71-MD4
Local Modem Option:
Rings to Auto-Answer................... 2
Modem Connectivity Timeout.............60 minutes
Modem Inactivity Timeout...............60 minutes
Login Setup:
Header Text ...........................Enabled
Menu Mode .............................Enabled
Auto Connect Module & Port
+----+------------+------+----------+
|User| Name | M: P | Auto |
+----+------------+------+----------+
| 1 | admin | 1: 1 | Disabled |
+----+------------+------+----------+
Assigned User Ports:
+----+----------* +-M3-+-M4-+-M5-+
|User| Name \|1234|1234|1234|
+----+------------*----+----+----+
| 1 | admin |1234|1234|1234|
+----+------------*----+----+----+
User Dialback Phone number
+----+-----------+-----------------+----------+
|User| Name | Phone number | Dialback |
+----+-----------+-----------------+----------+
| 1 | admin | | Disabled |
+----+-----------+-----------------+----------+
Dialback Delay.........................10 seconds
Access Control:
Serial Port access:
1)...Prompt for User Name: Disabled
2)...Prompt for Password : Disabled
Modem Port access:
3)...Prompt for User Name: Disabled
4)...Prompt for Password : Disabled
Auto Connect Module & Port
+----+------------+------+----------+
|User| Name | M: P | Auto |
+----+------------+------+----------+
| 1 | admin | 1: 1 | Disabled |
+----+------------+------+----------+
+----+----------------+-------+------+------+------+----+----+----+----+
|Port| Port | Baud | Word | Stop |Parity|Xon/ Xoff|LineDrive|
| | Name | Rate | Size | Bits | |Xmit|Recv|DTR |RTS |
+----+----------------+-------+------+------+------+----+----+----+----+
| 1 |Host EIA-232 | 9600 | 8 | 1 | None | Off| Off|High|High|
| 2 |Host V90 Modem | 115.2k| 8 | 1 | None | Off| Off|High|High|
+
----
+
----------------
+
-------
+
------
+
------
+
------
+
----
+
----
+
----
+
----
+

DS71-MD4 Serial host and 56k Modem
16
Serial Port Configuration
Handshaking, Baud Rate, Word Size, Stop Bits, and Parity are configured through either the serial or
Ethernet ports using the menus. Xon/Xoff, RTS and DTR Line Drivers can only be configured through
the phone line via a modem. The default settings are 9600bps, 8 data bits, no parity, one stop bit,
Xon/Xoff Off and RTS/DTR High.
IMPORTANT: Changing the Host module serial port configuration could create a
communications lock-out if the terminal computer serial port configuration does not match the
host module.
Baud Rate
Select “Baud Rate” to change the rate the modem transfers Data bites per second, the DS displays the
following: Default is 9600
Word Size
The word size is the measurement of the actual data bits in a transmission. Which setting you choose
depends on what information you are transferring. For example, standard ASCII has values from 0 to
127 (7 bits). Extended ASCII uses 0 to 255 (8 bits). If the data being transferred is simple text (standard
ASCII), sending 7 bits of data per packet is sufficient for communication. A packet refers to a single
byte transfer, including start/stop bits, data bits, and parity.
Select “Word Size” and the DS displays the following: Default is 8
+----+----------------+-------+------+------+------+----+----+----+----+
|Port| Port | Baud | Word | Stop |Parity|Xon/ Xoff|LineDrive|
| | Name | Rate | Size | Bits | |Xmit|Recv|DTR |RTS |
+----+----------------+-------+------+------+------+----+----+----+----+
| 1 |Host EIA-232 | 9600 | 8 | 1 | None | Off| Off|High|High|
+----+----------------+-------+------+------+------+----+----+----+----+
Exit/Save......1 Set Parity........5
Set Baud Rate..2 Set Xon/Xoff......6
Set Word Size..3 RTS Line Driver...7
Set Stop Bits..4 DTR Line Driver...8
Enter Request :
" 300 " ......1
" 600 " ......2
" 1200 " ......3
" 2400 " ......4
" 4800 " ......5
" 9600 " ......6
"19200 " ......7
"38400 " ......8
"57600 " ......9
"115.2k" ......A
Enter Select :

DS71-MD4 Serial host and 56k Modem
17
Stop Bits
The Stop Bits are used to signal the end of communication for a single packet. Since the data is clocked
across the lines and each device has its own clock, it is possible for the two devices to become slightly
out of sync. Therefore, the stop bits not only indicate the end of transmission but also give the computers
some room for error in the clock speeds. The more bits that are used for stop bits, the greater the
lenience in synchronizing the different clocks, but the slower the data transmission rate.
Select “Stop Bits” the DS displays the following: Default is 1.
Parity
Parity is a simple form of error checking used in serial communication. For even and odd parity, the
serial port will set the parity bit (the last bit after the data bits) to a value to ensure that the transmission
has an even or odd number of logic high bits. For example, if the data was 011, then for even parity, the
parity bit would be 0 to keep the number of logic high bits even. If the parity was odd, then the parity bit
would be 1, resulting in 3 logic high bits. This allows the receiving device to know the state of a bit so as
to enable the device to determine if noise is corrupting the data or if the transmitting and receiving
devices' clocks are out of sync.
With no parity selected, it's assumed that there are other forms of checking that will detect any errors in
transmission. No parity also usually means that the parity bit can be used for data, speeding up
transmission. In modem-to-modem communication, the type of parity is coordinated by the sending and
receiving modems before the transmission takes place.
Select “Parity” the DS displays the following: Default is None.
XON/XOFF
For a simple communication between modems three connected lines are needed: TX, Rx, and Ground.
For the data to be transmitted, both sides have to be clocking the data at the same baud rate. While this
method is sufficient for most applications, it is limited in being able to respond to problems such as the
receiver getting overloaded. This is where serial handshaking can help. XON/XOFF is software data
flow communications protocol for controlling the flow of data between Baytech and other devices.
Baytech units will send an XOFF character when it can't take any more data and when it can once again
take more data, will send an XON character to the transmitter.
Select “Xon/Xoff” the DS displays the following, Default is Off:
" 5 " ......1
" 6 " ......2
" 7 " ......3
" 8 " ......4
Enter Select :
" 1 " ......1
" 2 " ......2
Enter Select :
" None " ......1
" Even " ......2
" Odd " ......3
Enter Select :

DS71-MD4 Serial host and 56k Modem
18
RTS/DTR Line Driver Inactivity State
RTS (Request to Send)/ DTR (Data Terminal Ready) is normally used in conjunction with an external
modem. With no modem the RTS and DTS default state is High.
Select “RTS Driver State” the DS displays the following:
Select “DTR Driver State” the DS displays the following:
Port Device Name
Select a port and type the new name:
Port Select Code
The Port Select Code is an ASCII character string sent by the host terminal to the module to select an
I/O port on a DS74 peripheral module. The Port Select Code’s factory default setting is $BT and is
programmable up to 8 characters as shown.
Attention Character
Pressing the Attention Character 5 consecutive times will access the network main menu. The Default is
a semi-colon (;). Select this option to change the attention character. The DS displays the following:
NOTE: If you change the attention character and forget which letter or symbol you selected, the
attention character will not echo if you are typing the correct character. You can type each
character/symbol on the keyboard to find it, or reset the module to factory default to get the
semi-colon back.
Output Flow Control (Xmit) - Xon/Xoff is ( Off )
Stop/Restart Output Upon Receiving of Xoff/Xon ? (Y/N) :
Input Flow Control (Recv) - Xon/Xoff is ( Off )
Xoff/Xon sent based on Buffer - Full/Empty condition ? (Y/N) :
RTS Line Driver Inactive State is: High
High ? (Y/N, CR for no change):
DTR Line Driver Inactive State is: High
High ? (Y/N, CR for no change):
Enter New Port Name (Max. 16 characters):
or press ENTER for no change ................:
Port Select Code :$BT
Change It ? (Y/N) :
Attention Character :;
Change It ? (Y/N) :

DS71-MD4 Serial host and 56k Modem
19
Disconnect Timeguard
This feature ensures reliable binary data transmission by providing a one-second “Timeguard” after the
DS-Series receives the attention character. If more data is received within the delay period, the DS
treats the character as data, not an attention character; thereby preventing unwanted port disconnection.
The Default setting is Disabled.
Connect port ID Echo
When a user logs into the DS unit the port is identified in the following example:
Select option 1, to disable the echo. The Default setting is Disabled.
Select option 2 to echo the module and port number. (i.e. 3,2)
Select option 3 to echo the device name. (Device A)
Login Setup
This menu allows the user to enable or disable the Header, Access Control, Menu, Manage Users, Auto
Connect, Dial Back Number, and Assign User Ports.
Disconnect Time Guard :Disable
d
Enable ? (Y/N, CR for no change):
BAYTECH
For further information check:
http://www.baytech.net/
DS71MD4 <= Device name Port echo.
or
02,1 <= Module and Port Number echo.
Disable Port ID Echo ...........1
Use Module, Port Number ........2
Use Port Name ..................3
Login Setup:
Header .......................1 Enable/Disable header for each menu
Access Control ...............2 Enable/Disable Network/Serial port user name
and password.
Menu .........................3 Enable menu on startup or 5 attention Char.
Manage Users .................4 Add/Delete users and change passwords.
Auto Connect .................5 Auto connect to module and port on power-up,
Has priority over setup menu, Disables the
menu selection screen on initial login.
Dial Back Number .............6 Have the modem to dial back the user
Assign User Ports ............7 Assign users to specific ports
Exit ......................X,CR Returns to previous menu
Enter Request :

DS71-MD4 Serial host and 56k Modem
20
Header
If enabled, the following header appears with the main menu upon initialization of power or after a
modem connection to the host module has been established. If disabled, the header does not appear with
the main menu. Default Header is enabled.
Access Control
This feature configures the Serial and Modem port access by enabling the module to prompt for user
name and password. Default for both is disabled.
CAUTION: Before you enable the password for either Serial Port or Network access, verify the
admin password is known, or you could create a lockout condition. If the password lockout
condition occurs, you will need to reset the DS71-MD4 host module to the factory defaults.
The host module confirms the option you selected to change.
Menu
This allows the admin to enable or disable the Menu on start up. If disabled, the header appears upon
login without the main menu. To invoke the main menu when disabled, enter the attention character five
times (;;;;;).
The default user and password is “admin/baytech”, all lower case.
Manage Users
This option allows the administrator to change user passwords or add/delete new users. Up to 19 users
plus an administrator allowed. Usernames are case sensitive and alphanumeric.
NOTE: The “admin” can not be deleted.
Header Text :Enable
d
Enable ? (Y/N, CR for no change):
Access Control:
Serial Port access:
1)...Prompt for User Name: Disabled
2)...Prompt for Password : Disabled
Modem Port access:
3)...Prompt for User Name: Disabled
4)...Prompt for Password : Disabled
Enter Select :
Enable prompt for network user name? (Y/N)>y
Menu Mode :Enable
d
Enable ? (Y/N, CR for no change):