Installation guide

Page 8 Installation Instructions: AM-3501 Expansion Subsystem
6.0SERIAL I/O BOARDS - INSTALLATION AND CABLING
The following sections describe how to install serial I/O boards into your AM-3501
subsystem. Depending on board types, you can install up to 7 serial I/O paddle cards
into the subsystem. As previously noted, the B-channel subsystem expansion bus
supports
only serial I/O paddle cards.
The maximum number of expansion serial I/O boards is determined by two factors: The
number of B-channel I/O addresses consumed by each board, and the physical number
of available rear panel mounting slots. Each AM-358 board consumes (4) I/O
addresses; each AM-355 board consumes (3) I/O addresses; and each AM-359 board
consumes only (1) I/O address.
Referring to the previous B-Channel I/O Address chart you can see that there are only
(16) SIO Board Select Numbers available (0-15), and each board select number
corresponds to a starting I/O address. So, if you are installing
only AM-358 boards, the
maximum number you can install is four (using SIO Selects 0, 4, 8, and 12). If you are
installing
only AM-355 boards, the maximum number you can install is five (using SIO
Selects 0, 3, 6, 9, and 12). If you are installing
only AM-359 boards, the maximum
number you can install is seven (using SIO Selects 0-6) due to the physical number of
mounting slots on the AM-3501 rear panel.
When mixing the various types of I/O boards on the same I/O bus, you must set
the I/O select jumpers on each board based on the number of I/O addresses
consumed by each of the preceeding I/O boards! For more detailed information
refer to the applicable Installation Instructions for each board type.
6.1The AM-349 Interface Board
The AM-349 board, shown in the following illustration, serves several purposes; it has
internal and external 60-pin connectors for linking the serial I/O boards to the rear panel
of the AM-3501 subsystem;it provides power to the serial I/O boards;and it has an on
board load resistor to ensure the power supply always has an adequate load.
The AM-349 is factory installed in the subsystem. The cabling that connects the
AM-349’s
external 60-pin J3 connector to the rear panel, and the cables supplying
power to the board, are also factory installed. The only connection you will have to
make is plugging in the daisy-chain cable from the serial I/O boards, to the
internal J4
connector on the AM-349 board.
EXTERNAL 2 J3
INTERNAL 2 J4
1
1
LOAD RESISTOR
POWER CONNECTOR
MAC510
AM-349 Interface Board
PDI-03501-00, Rev. A00