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2.2 Connections
Initial use and testing require that the AVT-718 be connected to a power supply and the host
computer serial port. Refer to Sections 6.3.2, 6.3.6, and 6.3.7 for pin assignments of the AVT-718
connectors.
The external power source should be a n12v (minimum of +9.0v and maximum of +30.0v).
It is recommended that the serial cable (provided with the “hardware” package, #718-002) be used
during initial testing. Serial communications between the AVT-718 and the host computer utilize
RTS/CTS hardware handshaking - all relevant pins must be connected.
No other equipment or connections are required to get the unit up and running and establish
communications between the AVT-718 and the host computer.
2.3 RS-232 or RS-422
Communications with the host computer are via a serial communications link. The AVT-718 is
configured at the factory for either RS-232 or RS-422 for the communications link to the host
computer.
It is not recommended that the user attempt to change the configuration “in the field.”
To identify which configuration an AVT-718 is set for, look on the AVT-718 PC board, near the
DE-9S connector. Locate devices U37 and U40.
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If U37 is installed then the unit is set for RS-232 operations.
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If U40 is installed then the unit is set for RS-422 operations.
At no time should both devices be installed.
There are other minor differences between the two configurations; some resistors are either
installed or not installed.
Contact the factory if you require additional information about the configuration of an AVT-718.
2.4 Communications with the Host Computer
Once the hardware connections have been made, proper operation of the hardware can be observed.
•
On the host computer use a binary communications program.
[Contact the factory for a free copy of our “Hex Terminal” software.
Hex terminal software is available for DOS, Win3.1x, and Win98/NT.]
•
Set the parameters of the communications program appropriately (as determined by the
configuration of the AVT-718 interface).
•
Turn on the AVT-718 interface unit.
•
Observe on the AVT-718 board that the green (power) LED is lit.
•
Observe that the red (operations) LED is blinking fast.
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