The JT4 bulkhead connector has two options a three pin connector and a four pin connector. If JT4 is a three pin connector, this indicates a standard connector configuration. If JT4 is a four pin connector, that means that the 9plus is configured for 9600 or 19200 serial data and has the uplink feature equipped. Keep in mind that the 11 deck unit must also match the SBE9plus configuration for the serial uplink feature, otherwise it will not communicate properly with the SBE9plus.
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