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DS2/DS4 Hardware Manual
Page 20
5.2.4
Signal Interface to 9 way ‘D’ type connectors
The DS4 has a few optional rear plates that provide four or eight 9-way 'D' type connectors (DB-9) which may
plug directly into the 50-way termination on the AIM104-SER4.
The pin-out of the DB-9 serial interface is presented as follows:
The direction of data with respect to the DS4 is such that the DS4 acts as a DTE device. This means:
TX
is used to transmit data from the DS4.
RX
is used by the DS4 to receive data.
GND
must be connected to an RS-232 GND on the other device for proper communication.
RTS
is asserted prior to the DS4 sending data.
CTS
must be received before data will be transmitted (a jumper from RTS may be used, if
no handshaking lines are required for a modem).
DTR
is asserted to indicate the DS4 is ready to receive data.
DCD
must be received before incoming data will be accepted (a jumper from DTR may be
used, if no handshaking lines are required for a modem).