Verilink DDS Lite (34-00295.C) Product Manual - Manual (Page 13)

Connections 7
RS-232 Port
Connection
The RS-232 connector is a standard DB-25 female, configured as
a DCE port.
The RS-232 pin assignments are shown in Table 2-2. Only
circuits serviced by the unit are listed. All unbalanced bipolar
inputs and outputs meet RS-232C physical and electrical
specifications. The asynchronous mode is ITU V.22 compliant.
Power Plug the connector from the power supply into the unit. Plug the
transformer into an appropriate outlet. This applies power to the
unit.
Table 2-2 Equipment Connection
Circuit RS-232 Signal Function (Note: All other pins are open.) DCE
101 1 Frame Ground - This circuit is used to terminate shields. Gnd
102 7 Signal Ground - This circuit is used as the return reference
for unbalanced signals. Gnd
103 2 Transmit Data - This input is used for synchronous TD from
the DTE. It is transmitted on the DDS side. In
104 3 Receive Data - This output is the data decoded from the
incoming DDS receive data. Out
105 4 Request To Send - This input is a control line from the DTE
indicating data is to be transmitted. When RTS is On (space),
the data transmitter, the zero suppression circuitry, and the
CTS are enabled. When RTS is Off, the transmitter sends idle
code and the CTS is forced Off. In
106 5 Clear To Send - This output is a DCE response, indicating
that either RTS is On or S1 - 7, position B, is forcing CTS On.
When S1 -6 is in position B, RTS and DCD must be On for
CTS to be On. Out
107 6 Data Set Ready - This output is On when the unit is powered. Out
109 8 Data Carrier Detect (DCD) - This output is On when the
correct data or zero suppression code is being received and
DSR is On. It is Off when either DSR is Off, the DDS
receiver has lost sufficient signal to operate for at least one
second, or the receiver has received OOS, OOF, idle, or loop
codes for about 20 U.I. Out
114 15 Transmit Clock - This output is supplied by the DCE as an
external DTE timing source. It is generated from the internal
data clock or the far end transmit data. Out
115 17 Receive Clock - This clock output is the timing for the RD
and is always used to time the receive data. This clock is
always derived from the DDS receive data. Out