Campbell SAT ARGOS Manual de usuario Pagina 87

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ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 79
6.2. DIRECT TERMINAL ACCESS
The following is the schematic of the ZENO
®
-3200-to-PC cable (Revision B). This is a reversible cable
DE-9F to DE-9F.
90
Figure 6-1. 9-pin to 9-pin ZENO
®
-3200-to-PC cable (Revision B).
6.3. HARDWARE HANDSHAKING
The ZENO
®
-3200 always monitors the DCD line, whether or not it is set up for modem communications.
To conserve power, the ZENO
®
-3200 only sets its serial ports to receive
commands when DCD is asserted.
91
The ZENO
®
-3200 will continue to monitor the serial ports for up to two seconds when DCD is lost in the
event that the loss of connection is momentary.
DCD is considered asserted if the voltage supplied by the receiving end is
within the range +3 to +25 VDC.
92
The ZENO
®
-3200 also monitors CTS if the ZENO
®
-3200 is configured for telephone modem
communication as specified in the Modem Menu. In this case, it will not transmit any data unless CTS is
asserted.
93
The reason for this is to avoid collisions between modem handshaking and regular messages
transmitted from the ZENO
®
-3200.
90
Pins 1 and 9 are tied together internal to the ZENO
®
-3200.
91
Monitoring the serial ports continuously draws a significant amount of power.
92
As defined by Engineering Department, Electronic Industries Association, ANSI/EIA-232-D-1986. Electronic
Industries Association: Washington D.C, 1987; Section 2.1.4.
93
It will, however, respond to user commands.
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