Overview

Ultra Encoders and Decoders have a null modem jumper on the bottom of the unit that flips the transmit and receive pins on the RS232 port.

The nature of RS232 is that there is always a 50% chance that you have the correct cable. By flipping the jumper, to the alternate position, you ALWAYS have the correct cable.

When using a Just Add Power Flux Capacitor IR Dongle (v1 or v2), the pins should ALWAYS be set to the Crossover position.

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Null Modem Jumper

The null modem jumper on Omega and Ultra devices is a 2x3 rectangle of pins. There are two valid positions for the null modem jumper, regardless of orientation:

One position is straight-through, one position is crossover. The orientation on the null modem jumper may be different on each device.

 

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Encoder Pinouts

OM-705POE/UL-707POE/UL-747POE

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UL-708POE

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UL-709P2P

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UL-717HIFI

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OM-715POE/UL-718AVP/UL-718KVM/UL-749AVP/UL-749KVM

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Decoder Pinouts

OM-505POE/UL-508POE

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UL-509POE

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OM-515POE/UL-518AVP