Teledyne T100 Instruction Manual page 279

Teledyne ML - T100 UV Fluorescence SO2 Analyzer
10.6.9.2. MODEM OR TERMINAL OPERATION
 If a modem is used, additional configuration and wiring rules must be observed. Refer
to Section 5.3.2.6.
 Incorrect setting of the DTE - DCE Switch. Refer to Section 3.4.8.3.
These are the general steps for troubleshooting problems with a modem connected to a
Teledyne ML analyzer.
 Check cables for proper connection to the modem, terminal or computer.
 Check the correct position of the DTE/DCE switch as described in Section 3.4.8.3.
 Check the correct setup command (refer to Section 5.3.2.6).
 Verify that the Ready to Send (RTS) signal is at logic high. The T100 sets Pin 7 (RTS)
to greater than 3 volts to enable modem transmission.
 Ensure that the baud rate, word length, and stop bit settings between modem and
analyzer match (refer to Section 5.3.2.6 and Section 5.1).
 Use the RS-232 test function to send "w" characters to the modem, terminal or
computer. Refer to Section 5.1.6.
 Get your terminal, modem or computer to transmit data to the analyzer (holding down
the space bar is one way). The green LED on the rear panel should flicker as the
instrument is receiving data.
 Ensure that the communications software is functioning properly.
Further help with serial communications is available in a separate manual "RS-232
Manual", Teledyne ML's P/N 013500000, available online at
ml.com/manuals/.
06807A(DCNxxxx)
Troubleshooting & Repair
http://www.teledyne-
279