Pacific Research Solutions PET-820 User Manual
Page 46
Pacific Research
PET-820 User Manual
Page 45
5.3.1
SERIAL COMMAND MODE
The serial command mode operates much in the same manner as the Touch-Tone command mode when entering data. Refer
to sections 3 and 4 for detailed operations. When a terminal is first connected to the PET-820, the system in not in the
command mode. To enter into the command mode, use ^C (Control+C). To exit the command mode use the Escape key.
When the command mode is entered the PET-820 will return with a sign-on message and a prompt to enter a command. All
serial command use a two digit number, the same as used for the Touch-Tone commands. The main difference is that you
only enter the two digit command and the PET-820 will prompt you for data. The serial command mode will also respond to
two letters commands. Rather than detailing each of these commands, if you enter the command "HP" (Help).
The PET-820 will list all of the two letter command and there descriptions
5.3.2
SERIAL STATUS MODE
The serial status mode, when enabled by command "55" will set the PET-820 to output status information with date and time.
This information can be used the determine the internal operation of the system. This information can be valuable for
monitoring system operation and debugging. When the serial command mode is enabled, the status mode will temporarily
disable. Once the command mode is ended the status mode will re-enable.
5.4
RADIO INTERFACE PROTOCOL
The radio interface works in the same manner as the telephone interface except that the PET-820 provides for a Push To Talk
(PTT) and Carrier Operated Switch (COS) signals to operate a standard 2-WAY radio. Instead of a telephone ring signal, the
user is required to send the Password in order to gain access into the system. When this protocol is selected, do not connect to
a telephone line except to make changes in programming if required. The PET-820 is not set up to communicate over both
telephone and radio at one time. But you can still use the telephone communication for programming, when the radio is not
in use. The main difference is that when an alarm is detected the unit will not try to sent the alarm via the telephone but only
the radio. However when the telephone mode is selected the PET-820 will operate the PTT any time there is a speech
message to send. For additional information on wiring this feature refer to figure 6.4.
The PTT and COS input/output are both 5 volt logic levels. The PTT goes high (+5 volt out) when the PET-820 wants to key
the radio transmitter, this output is capable of driving 1 mA load. The COS is active (+5 volt in) when a signal is present on
the radio receiver. The COS signal is only required when you don't want the PET-820 to transmit when the radio receiver
has detected an active signal.
5.5
TELEPHONE COMPANY INFORMATION
In compliance with the requirements of Part 68 of the FCC Rules and Regulations for connection of a terminal system (this
device is classified as terminal system) to the telephone network and for your convenience, the following information is
presented.
The telephone company may make changes to it's communication facilities, equipment, operations or procedures, where such
action is reasonable and required in it's business and is not consistent with the rules and regulations in FCC Part 68 of the
FCC Rules and Regulations. If such change can be expected to render the PET-820 incompatible with the telephone company
facilities, the telephone company shall give it's customers adequate notice to make modifications to maintain uninterrupted
service.