Technical Manual Issue 2.1 4000 Digital Series II
Page 96 STA0381
4.8.6 PDE 4619 - General Purpose Interface (GPI) RCU
The GPI card provides 32 open-collector outputs and 32 15V CMOS inputs for DC input and output
control of external equipment from the 4000 Digital Series.
The card is controlled from the Microprocessor card (PDE 4642); electrical connection is via the main
busses. Each GPI card is individually addressable and once selected can be read from or written to by
means of the control lines on the busses.
The 32 control inputs are level-detected and multiplexed to the bus data lines D0 to D15 via tristate
buffers. The 32 control outputs are demultiplexed and held steady by on-board latches. Card 1, output
1 is designated as CPU Fail.
4.8.6.1 Card Location
These cards may be located in any RCU slot from 3 to 20 in the 4920 matrix, or any RCU slot from 2 to
7 in the 4420 matrix. However, these RCUs can only be fitted in a free RCU slot.
Table 13: PDE 4628 RS422 RJ45 Pinout
RJ45 Connector
Description (Matrix End)
Pin Number
Data Receive (Rx+) 1
Data Receive (Rx-) 2
Audio Input (+) 3
Audio Output (+) 4
Audio Output (-) 5
Audio Input (-) 6
Data Transmit (Tx+) 7
Data Transmit (Tx-) 8
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