3.1 Serial Port J51
The serial port (J51), utilizes the 9 contact female D subminiature
style connector shown below. A brief description of each signal is
included in the J51 I/O table on following page. For additional
information, please refer to the OC950 Serial Communications
Transceiver Schematic at the end of this section.
I/O Table
Input/Output Pin Number Explanation
+5 VDC RTN/ Shield J51-1 Common/shield
RS-232 TXD J51-2 RS-232 transmitter output (from OC950)
RS-232 RXD J51-3 RS-232 receiver input (to OC950)
+5 VDC J51-4 +5 Vdc output (200 mA maximum
between J51-4, J52-25 & J4-25)
I/O RTN/+5 VDC RTN J51-5 Common
RS-485 TXD (+) J51-6 RS-485 transmitter output (from OC950)
RS-485 TXD (-) J51-7
RS-485 RXD (+) J51-8 RS-485 receiver input (to OC950)
RS-485 RXD (-) J51-9
MA950 3-3
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