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EN530 HDTV Smart Encoder IV
Appendix B: RS422 Configuration
32
Serial data ports P1, P2 and P3 are individually configurable for RS422 operation.
RS422 can be used for greater signal integrity over longer distances.
Because ATSC encoders typically do not support RS422 protocol, a RS422 to
RS232 converter will be required if P1 is set for RS422 operation.
To reconfigure for RS422:
1. Unscrew and remove the top panel of the Encoder.
2. Unscrew and remove the HD I/O board labeled PC00E12-1A.
3. Located under the HD I/O board is the serial I/O board labeled PC94E2-2D.
The relevant section of the board is shown below.
1
S3A
2
3
U7
1
2
3
4. Port P1 is controlled by the jumper settings on the selection headers marked
S1A and S1B. Ports P2 and P3 correspond to the selectors marked S2A and
S2B, and S3A and S3B, respectively.
4. A port will operate in RS232 mode if the jumpers on its corresponding
selectors connect pins 1 & 2. It will operate in RS422 if the jumpers connect
pins 2 & 3. All jumpers in both the A and B headers for each port must have
the same setting; thus, a total of four jumpers per port must be switched for a
correct reconfiguration.
©2000-2007 EEG Enterprises, Inc.
S2A
1
1
1
2
2
2
3
3
3
U6
U8
1
1
1
S3B
2
2
2
3
3
3
S2B
S1A
1
1
2
2
3
3
U9
S1B
1
1
2
2
3
3
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