DS71-MD4 Serial host and 56k Modem
5
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.
