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DS2/DS4 Hardware Manual
Page 14
4.3.3
RS-232 Serial Interface: COM0 to COM3
Four 9-way 'D' type connectors (DB-9) for COM0 through COM3 are located on the front of the Director
enclosure from the SCT-AIM104 board, which receives its signals via a 50-way ribbon cable to the AIM104-
386EX. SCT-AIM104 links JP1-JP4 must be in the “RS232” position.
The pin-out of the DB-9 serial interface for RS-232 is presented as follows:
* = output signals from processor
DB-9 Male
DB-9
2 RX
3 TX*
5 GND
7 RTS*
8 CTS
4 DTR*
1 DCD
6 DSR
RS-232 Pinouts (DTE)
1 2 3 4 5
6 7 8 9
Drg. S15037-04a
The direction of data with respect to the Director serial interface is such that the Director acts as a DTE (Data
Terminal Equipment) device. This means:
TX
is used to transmit data from the Director.
RX
is used by the Director 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 Director 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 Director 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).
Содержание Director DS2
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