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
