Rs-232 Communications - Teledyne T200 User Manual

For a failure associated with the DOM, the analyzer could stop during initialization
•
(the front panel display shows a fault or warning message), a likely indicator that the
DOM, the firmware or the configuration and data files have been corrupted.

RS-232 COMMUNICATIONS

G RS-232 T
ENERAL
Teledyne API's analyzers use the RS-232 communications protocol to allow the instrument
to be connected to a variety of computer-based equipment. Problems with RS-232
connections usually center around five general areas:
Incorrect cabling and connectors. See Section 2.3.1.8 under RS-232 Connection for
•
connector and pin-out information.
The BAUD rate and protocol are incorrectly configured. See Section 2.3.1.8 under
•
RS-232 Connection.
If a modem is being used, additional configuration and wiring rules must be observed.
•
See Sections 3.1 and 3.2.
Incorrect setting of the DTE – DCE Switch. See Section 3.1 to set correctly.
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Possible improper/incomplete seating of the cable (P/N 03596) that connects the
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serial COM ports of the CPU to J12 of the motherboard.
T
ROUBLESHOOTING
These are the general steps for troubleshooting problems with a modem connected to a
Teledyne API's analyzer.
1. Check cables for proper connection to the modem, terminal or computer.
2. Check to ensure that the DTE-DCE is in the correct position as described in
Section 3.1.
3. Check to ensure that the set up command is correct.
4. Verify that the Ready to Send (RTS) signal is at logic high. The analyzer sets pin
7 (RTS) to greater than 3 volts to enable modem transmission.
5. Ensure that the BAUD rate, word length, and stop bit settings between modem
and analyzer match.
6. Use the RS-232 test function to send "w" characters to the modem, terminal or
computer.
7. Get your terminal, modem or computer to transmit data to the analyzer (holding
down the space bar is one way); the green LED should flicker as the instrument
is receiving data.
8. Ensure that the communications software or terminal emulation software is
functioning properly.
158 Teledyne API T200 NO/NO
ROUBLESHOOTING
A /M T
NALYZER ODEM OR
/NO Analyzer with NumaView™ Software
2 x
O
ERMINAL PERATION
083730200A DCN7962