Cable Construction Guidelines; Cable Length; Cable Type; Cables Available From Alpha Micro - Alpha Microsystems AM-6060 Owner's Manual

Connector Configurations

CABLE CONSTRUCTION GUIDELINES

If you want to construct your own cables, there are a few things you should keep in mind:

Cable Length

We strongly recommend that RS-232C cables attached to the AM-6060 use twisted-pair cable with an
overall shield. As you increase the cable length beyond 100 feet, the reliability of the data signal
decreases. If the cables absolutely must be longer than 100 feet, signal conditioning equipment (for
example, a "short haul modem") can improve signal quality.

Cable Type

We recommend you use a twisted paired shielded and jacketed cable. The cable should be rated at least
CMP Level 3, but you can use CMP Level 5 cable for lines longer than 100 feet. Most cities require that
any low voltage communication cable have a CMP (Communication cable Plenum) rating. This type of
cable should comply with your local fire codes for installation in your facility. Using a high quality
twisted paired, overall shielded cable helps minimize electromagnetic interference. Reducing this
interference protects your system from signal noise. It also protects other devices around your Alpha
Micro computer system (such as a TV or radio) from interference radiated by an improperly shielded
system.
RS-232 RJ-45 CONNECTOR SIGNALS
The table below gives pinout information for the RJ-45 ports on the AM-90 card attached to the AM-
301-10. Pins are numbered from left to right, looking into the port from outside the computer chassis.
Pin # Description
1 Chassis ground (shield)
2 Clear to send
3 Transmit data
4 Request to send
5 Receive data
6 Data terminal ready
7 Signal ground
8 Data carrier detect

CABLES AVAILABLE FROM ALPHA MICRO

The serial ports on the AM-6060 use the same plug-and-play external cabling kits as the AM-359 serial
I/O boards. The list below gives the part number and a brief description of each cabling kit available for
the AM-6060.
These cabling configurations meet the USOC (United Standards Organization Committee)
Standards.
AM-6060 Computer Owner's Manual, Rev. 00
GND
CTS
TXD
RTS
RXD
DTR
GND
DCD
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