TEK-TCG 01-G-Manual-v6-052021
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P4 pin 1 Programmable Output
The user may configure the P4 pin 1 output to operate with inverted or non-inverted polarity,
and:
A user-configurable number of pulses per second, minute, hour, or day with adjustable
pulse width and offset.
IRIG-B time code (unmodulated DCLS or modified Manchester) with optional IEEE
C37.118.1 or AFNOR NF S87-500 extensions.
Simulated DCF77 receiver time code.
Refer to the Tekron Configuration Tool Manual for further information.
P4 pin 1 is not available on TCG 01-G with DTE serial port. If not specified, TCG 01-G
will ship with a DCE serial port.
P5: AM IRIG-B Output (BNC Connector)
P5 provides AM IRIG-B (B12x) over a BNC connector. This output is not
programmable for other types of signal and a 1 kHz carrier is present whenever
the unit is powered. The IRIG-B data content is as specified by the Tekron
Configuration Tool program.
Use either a coaxial cable or a shielded twisted pair cable to feed the signal from
P5 to any connected IEDs. When using shielded twisted pair, connect the shield
to ground.
The mark/space amplitude modulation ratio is 3:1, and peak to peak output level is 8 V (max),
120 Ω impedance. The output is fully floating, and is transformer-isolated to 3.75 kV.
If the P5 output is not being used, it may be left unconnected.
Most devices with amplitude-modulated IRIG-B time sync inputs have an input
impedance of between 4 kΩ and 20 kΩ, and a maximum allowable peak-to-peak
level of approximately 6 V.
The P5 output on the TCG 01-G is designed to drive multiple devices in parallel, with
a terminating resistor (typically 100-180 Ω) fitted at the far end of the coax line
feeding the attached loads.
With this configuration, P5 can drive at least 20, and typically 30 or more devices
(dependent upon layout, device input impedance, etc.), without any external
amplification. The terminating resistor is essential to ensure good noise immunity
and the correct voltage levels.