Entek IRD6652 monitor
The IRD6652 is the recommended standard where flat cable is used for the transmission of control signals and/or digital data. The maximum physical length is normally identified as 50 feet for RS-232C communication and no termination resistors are needed. Jumpers and resistors should be installed as shown in Figure 4-2 on page 74 through Figure 4-6 on page 78. The jumper configuration selected will depend on whether the equipment must be configured for DCE or DTE and whether the equipment will need to drive or receive the DCD and clock signals.
IRD6652 is not an actual formal part of the EIA recommended standard. The maximum permissible length of cable separating the generator and load is a function of the data signaling rate and is influenced by the tolerable signal distortion. As the data signaling rate is reduced below 90 kbit/s, the cable length is limited to 4,000 feet, assuming a maximum allowable 6 dB signal loss. The IRD6652 should be configured as shown for the IRD6652. A 100Ω terminating resistor must be installed and the 12 K IRD6652 pull-up resistor must be removed.
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