User Manual

URFI HOST PROGRAMMING
Universal RF Interrogator ? Host Programming Guide Page 11
AMCO Automated Systems • P/N 52845G125 Rev 1 FEB 2004
Chapter Four
URFI Host Programming
Customer Serial Interface
This chapter provides host programming information for the TRACE
Universal RF Interrogator.
Changes
The following changes have been implemented since Beta model:
Pressure Compensation
New Command for V9 support of Pressure Compensation Factors (see
PC and RC)
Power On/Off
Change Power On/Off from RTS (pin 7) to DTR (pin 4) and other small
corrections.
URFI Attributes and Performance Characteristics
1. Communications. The URFI uses a 9-pin RS232C cable
connection, with a Baud rate of 19200, 8 bits, and no parity.
2. Protocol. The basic protocol between the Customer Application S/W
(S/W) and the URFI is as Master to Slave. The S/W will originate all
commands and the URFI will provide an acknowledgment within a
maximum time interval (different for each command).
3. Power-on. The first “command” is turning on power to the URFI.
This is controlled by the DTR line (pin 4) in the serial port. This will
produce a cursor “URF>” when the URFI has initialized and is ready
for a command ( < 300 msec).
4. Power-off. Power-Down can be controlled the same way, the DTR
line, or with the Stand By (SB) command but the DTR uses much
less power (<0.5ma vs 100ma). SB can also be used as a
sleep/cradle mode, in which all commands would be ignored except
the Wake-Up command. This will allow the URFI to share the same
serial port with other devices or multiple URFIs.