Rear Panel Interfaces SFC6400A/SFC1450A Synthesized Frequency Upconverter
5-4 TM106 – Rev. 1.1
5.9 Equipment RS-485 (J10), Standard Backward Compatible Interface
The Equipment Multi-Drop, Full-Duplex, Bi-directional RS-485 Interface (J10) allows communication
between converters. Because the RS-485 Interface uses a master/slave (talker/listener)
configuration, the converter that is designated as the backup will automatically be established as
the master. Under normal RS-485 protocol, the master will poll a specific slave by address and
only then will the slave unit respond. The swapping of Transmit Data and Receive Data is
accomplished in the inter-converter cables, as the hardware interface is identical for all converters.
Refer to Table 5-5 for the connector pinout.
Table 5-5. J6 – Equipment RS-485 Interface
D-Sub 9-Pin Female Connector
Pin No. Signal
I/O Description
1 GND N.A. Ground
2 I2C_SCL O I2C Clock
3 N.C. N.A. No Connect
4 TX_485-B O Inverted RS-485 transmit
5 TX_485-A O Non-Inverted RS-485 transmit
6 I2C_SDA I/O I2C Data
7 N.C. N.A. No Connect
8 RX_485-B I Inverted RS-485 receive
9 RX_485-A I Non-Inverted RS-485 receive
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