Philips LBB 1330, Инструкция по эксплуатации

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5. SM40 MODULES
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5
5.13 I/O Port (Communications Link) - I/O LBB 1375/30
Printed circuit board, for mounting on Central Processor Card.
Standard RS232 communication, plus connector bracket for link with outboard computers.
One wire asynchronous communication, for use with Master Call Stations.
The SM40 I/O port is designed to carry out two functions; to communicate with external computer
equipment, and to control Key Confirmation indicators used with SM40’s Master Call Stations.
The standard RS232 serial interface, provided by the I/O port, allows the system to communicate with a
wide variety of personal, mini, and main-frame computers.
Dependent upon the software used, it is possible to use the outboard computer in 2 modes: Passive Mode,
and Active Mode.
To operate the communications link, a program must be provided on the computer. This would take the
form of a simple communications program, which sends 3 character command information to the relevant
serial port.
The communication has 8 data bits, and the baud-rate is selectable between 300, 1200, 2400, 4800 and
9600 baud. This, and the other I/O port parameters, such as number of Stop Bits, and Parity can be set in
the installer programming menu.
SM40’s standard default parameters are:
2400 baud, 8 data bits, 1 stop bit, even parity.
Each I/O port set, LBB 1375/00, comprises:
- I/O printed circuit board.
- RS232 connector, fitted to a mounting bracket.
- All necessary cables, connectors and mounting hardware.
The Asynchronous section of the I/O PCB is connected to the Key Confirmation PCB’s of up to 4 master
call stations. This facility transmits, to the KCPs, information which it has received from the CPC, telling it
which Selection Keys have been pressed. The KCP then sends power to the relevant key indicators.
Standard screened microphone cable, of maximum 200 metres in length, can be used to connect the
I/O card to the master call station(s).
The baud rate, and other parameters of the asynchronous port are all fixed, and therefore do not need to be
set by the installer.
Note: Detailed information concerning the communication protocol of the I/O PCB and other relevant
information can be found in the SM40 Installation Manual and the I/O documentation.
Passive mode
a: read, or record “static” information:
- Sources connected.
- System configuration.
b: read, or record “dynamic” information:
- Call logging.
- Failure information.
Active mode
- Program the matrix of SM40.
- Operate as a call station.
- Operate as a master call station.
- Up/Down-loading of programming.
- Auxiliary routing.