2-2. Module Description
U3-1021 2-2 2/99
Westinghouse Proprietary Class 2C
2-2.3. Personality Module
The Link Controller Personality module provides two (J1 and J2) male DB9
connectors for the desired serial links (see
Figure 2-1).
There are twoPersonality module groups for the Link Controller Module. Select the
appropriate group for the desired serial link.
Group One Personality Module
Group One (1C31169G01) provides for an RS-232 serial link.
• J1 Port is an RS-232 Programming Port which is used to interface to a Personal
Computer (used for keyboard input, CRT display, and file transfer functions).
• J2 Port is an RS-232 Applications Port (in CE Mark certified systems, the
application port cable must be less than 10 meters (32.8 ft)).
Group Two Personality Module
Group Two (1C31169G02) provides for an RS-485/RS-422 four-wire full duplex
serial link.
• J1 Port is an RS-232 Programming Port which is used to interface to a Personal
Computer.
• J2 Port is an RS-485 Applications Port (also may be used as an RS-422 serial
link).
— The J2 Port transmitter has a software controlled tri-state enable input (TX-
ENA). TX-ENA must be asserted (high or logic one) if the J2 Applications
port is to transmit RS-485/RS-422 serial data. It is the responsibility of the
Link Controller’s application program to ensure that TX-ENA is asserted
whenever serial data is transmitted from the J2 port.
— The application program must use Bit 1 of the Applications port UART
Modem Control register (MCR) to control the state of the UART’s RTS/
output. MCR is an eight-bit register mapped to the LC processor I/O address
03FCH.
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