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4.8 Serial Port One-Foot Resolution Configuration
The SSD120-(XX)N( )-RS232 incorporates five RS232 compatible outputs, TxD4 & TxD5 may be
software configured to transmit one-foot resolution data via the following procedure.
Connect the digitizer to an IBM compatible computer running HyperTerminal as described in §4.5
and as shown in the Dynamic Calibration Block Diagram. Assign the one-foot protocol as follows:
Apply power to the digitizer and after the self-test time has elapsed, altitude data will appear on the
PC screen.
Type<enter> The digitizer will respond with ?>(current altitude)
Type TCICAL<enter> Accesses the digitizer port assignment program.
The Digitizer responds T=
Type P<enter> To identify the current port settings.
The digitizer will respond with a two-digit number as follows:
TxD2 Protocol Data Resolution
The first digit represents the serial altitude data resolution.
1 = TxD4 & TxD5 standard assignment 10' or 100'.
2 = TxD4 & TxD5 One-Foot Resolution Data
The second digit represents TCI calibration data and is factory set to 2.
Software Configuration: Type P22<enter>
Defined as One-foot resolution data on TxD3 & TxD4 only.
Type QQ to exit the configuration mode and return to normal operation. To view the one-foot resolution
data, construct a wiring harness to bring pin 14 or 15 of the serial data receptacle to the receive port of the
PC.
NOTE: This change will lock the protocol assignment for TxD4 & TxD5. Jumpers on the connector and
software settings will only affect TxD1, TxD2 and TxD3.
a b
TCI Factory Calibration Data
Page 22 of 57
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