Specifications

38 Application Module
X
Service 3/96
Honeywell Inc.
Hardware Description of Coprocessor
4.3 Media Access Unit (MAU) Description
4.3 Media Access Unit (MAU) Description
Purpose
The Media Access Unit is the device that connects the A
X
M to the Plant
Information Network (PIN). It contains a transceiver device that adapts the
LAN interface of the coprocessor to the LAN (ethernet) cable.
There are many vendors that produce this type of device. The one shown in
the diagram is just one of the many available.
Media Access
Unit diagram
The following drawing illustrates one of the many types of MAU.
Media Access
Unit indicators
Many of the MAU devices have indicators on them. The following
indicator and switch explanation is specifically for the MAU shown in the
previous diagram.
Table 4-2 LTX-2 Indicators and Switches
LED Description
PWR (green) “On” to indicate +12 volt power is applied from the WSI board through
the WS2 I/O board and interface cable. Normally “on.”
HBE (AMBER) This feature (heartbeat) is not used with the Application Module
X
coprocessor. Normally “off.”
Switch Position Required Comment
RCV 0 (Feature not used)
HBE 0 (Feature not used)
LTX-2
Thin Coax Transceiver
IEEE 802.3 10Base2
LANTRONIX
Heartbeat
Power
10
HBE
RCV
1
0
Switches
Top View
HBE
RCV
HBE
PWR
Indicators
End View
40044
To
Coprocessor
(WSI2 I/O)
To PIN
(Ethernet)