
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 99
You may have to send the U{ENTER} command several times to enter the
User Interface if the ZENO
®
-3200 is controlling power to a two-way radio or
similar communications device using the Digital Control Output.
In this case, there is a design tradeoff between how often the ZENO
®
-3200
can power a two-way radio to check for user commands, and how much its
power consumption can be minimized.
6.6.5. Push-To-Talk (PTT)
Before the ZENO
®
-3200 can send a message to the radio for it to transmit, it must first assert the radio's
PTT line.
When a radio's PTT line is NOT asserted, its transmitter is NOT powered.
Asserting the PTT line forces the radio to turn on its transmitter. Several hundred milliseconds are
usually required for the transmitter's power level to reach a steady, normal value. for this reason, the
ZENO
®
-3200 can be configured to wait for the radio's transmitter to warm up before it attempts to send
any data through the radio. The "COM1 Push-to-Talk Setup Time" is located in Line Item #1 of the
Power Control Menu:
POWER CONTROL MENU
(Cn/m) Change Item n To Value m (Q) Quit
(E) Save Parameters To EEPROM (H) Help
(U) User Menu
Item 1: 100 (COM1 Push-To-Talk Setup Time)
Item 2: 0 (COM1 Switched Power Code)
Item 3: 0 (COM2 Switched Power Code)
Item 4: 0 (COM3 Switched Power Code)
Item 5: 0 (Response Delay Time (milliseconds)
>
A good setting of the "COM1 Push-To-Talk Setup Time" will depend upon your radio. The value set is in
milliseconds
6.6.6. Response Delay Time
When several two-way radios are being used, it is necessary for a remote two-way radio to provide an
adequate delay in response so that the host two-way radio has sufficient time to turn off its transmitter and
switch to receive mode. for this reason, the Power Control Menu contains Line Item #5, the Response
Delay Time.
When the Response Delay Time in the Power Control Menu is set, the ZENO
®
-3200 will wait the
specified number of milliseconds before it responds to any valid CCSAIL message it receives over the
two-way radio link.
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