Clear-Com RCS-2700 - Manual (Page 30)

R C S - 2 7 0 0 S O U R C E A S S I G N M E N T P A N E L 2 - 1 0
multiple serial ports which are not designed to be connected. Either one
or both of the ports will not work.
The communication interface is RS-232D and the settings are:
• 19200 baud
• 1 start bit
• 8 data bits
• 1 stop bits
• no parity
The RS-232D interface has a distance limitation of 300 feet of cable (91 meters),
but this is subject to the quality of the wiring used and the presence of electrical
noise and interference along the cable run. The pinout of the DB-9F serial port
connector on the rear panel is shown in the Table 2-2 below:
Table 2-2: Pinout of DB-9F Serial Port Connector
WIRING THE DATA-LINKS CONNECTORS TO EXPANSION UNITS (5)
Two data-link pairs are provided on the rear panel of each RCS-2700 for
connecting expansion units to the main unit. A single-pair connection between
the main unit and each expansion unit is required so that the main unit can
direct the operation of the system as a whole. This is a bi-directional, parallel
connection, and the two data-link pairs are connected together internally, so
there is no “in” or “out” connection per se. Note the location of the ground and
data connection pins in the following diagram.
PIN SIGNAL FUNCTION
1 CF Received Line Signal Detector (not used)
2 RXD Serial data from the RCS-2700 to the PC
3 TXD Serial data from the PC to the RCS-2700
4 DTR Data Terminal Ready (connected to DSR)
5 GND Signal ground
6 DSR Data Set Ready (connected to DTR)
7 RTS Request to Send (connected to CTS)
8 CTS Clear to Send (connected to RTS)
9 RI Ring Indicator (not used)
• The data links pairs
connect the main unit to
expansion units.