Trans-Cal SSD120 M Series, Installation And Calibration Manual

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1.3 Parallel Altitude Data Port Specifications
Code Format:
In accordance with the U.S. National Standard for Common
System Component Characteristics for the I.F.F. Mark X (SIF) Air
Traffic Control Radar Beacon System, SIF/ATCRBS.
Driver Description:
The parallel altitude data output is provided by the “uncommitted”
collectors of a transistor array and must be “pulled-up” through a
resistive load by the transponder.
Pull-Up Voltage: +3 to 50VDC.
Maximum Sink Current: 50 milliamperes.
Maximum Cable Length:
4000 feet.(1219 meters)
Input Signal Requirement:
Pin A (strobe or signal common) must be
either rounded or connected to the
transponder.
1.4 Serial Altitude Data Port Specifications
Electrical Format: conforming to the TIA/EIA RS232E standard.
Logic levels: ‘0’, +9 volts. Logic ‘1’, -9 volts.
Driver output maximum voltage: ±25 VDC.
Driver load impedance: 3K
S
typ.
One receiver allowed per serial port.
Maximum cable length: 50 feet. (15 Meters)
Code format: ASCII.
Communication system: simplex (talk only).
Transmission Method: asynchronous.
Transmission rate: selectable, 1200 bps to 9600 bps.
Update rate: 10/sec.