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S. Serial Interface
The RS-232 serial port gives pressure readings when requested by the terminal. The interface is
standard RS-232 format; 9600 baud, 8-bits, no parity, 1 stop bit. The interface is through the 15-
pin D-sub accessory connector, see Figure 8, page 13.
pin 7 is Tx (signal from the 960 to the terminal)
pin 8 is Rx (signal from the terminal to the 960)
pin 9 is return (ground).
The serial port allows reading pressure and other parameters of the 960; it is not possible to mod-
ify stored parameters over the serial port.
The following commands are used in the 960:
1. Pressure
To read the pressure of both gauges
Send “p” (ASCII value 112); the 960 sends pressure for gauge 1 and gauge 2 to the terminal. Out-
put is in the format:
when both gauges are on, the fields returned are:
CVT_gauge, CCG_gauge, <reserved>
in the format: ABeC, DEeF, OFF
where AB and DE are multipliers; C and F are exponents.
If a gauge is turned off, its field contains "OFF"
Some examples follow:
Displayed Pressure
Serial Output
OFF
Off
LO
Low
0.0-3
0.0e-3
0.8-3
0.8e-3
2.8-3
2.8e-3
-1.6-3
-1.6e-3
5.7-2
5.7e-2
2.3+0
2.3e+0
1.0+0
1.0e+0
4.1+2
4.2e+2
HI
9.9e+2
Figure 14: Serial Output and Displayed Pressure
Since both gauges are maintained in an active state, pressure data taken over the serial port are
valid for both gauges at the same time, regardless of which gauge is shown on the digital display.
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