Commands; Reading Data From System - Philips System 21 Quick Operating Manual

5. COMMANDS
Commands are given in ASCII-coded form. There are two types of commands:
1. Commands for the total System 21 that have to be routed to the master unit.
2. Commands for individual units that must be routed to the specific unit.
A full survey of these command codes can be found in the annex (for master
commands and slave commands valid for all slaves) and in the operating cards of
the individual units (for specific unit dependent commands) .
Examples:
Message Description
"AID;RESET" is a message to the master (AID) with the command
(RESET) to reset the system to the power-on conditions.
"AI 0201 ;CLOSE2,0PEN4" is a message to the slave PM2120 with address setting 1
(AID201) with the commands to close switch 2 and to
open switch 4.
6. READING DATA FROM SYSTEM 21
To input data from System 21, first a command message requesting for this data has
to be sent and after that the system has to be addressed as talker to read the data .
Example:
6
on P2000C on HP85
100 IEC PRINT #11,"AID311;1NP H"
100 OUTPUT 711;"AID311;1NP H"
110 IEC INPUT #11,R$
110 ENTER 711;R$
The first message is a request to the PM2131 with address switch set to 1 to send
the data, which is on the input lines. With the second statement the data are read
from the system.
Note: An input statement always returns the result of the last request for data.
Earlier sent requests are automatically cancelled.