Teledyne 9110T - Nitrogen Oxides Analyzer - Manual (Page 53)

Model 9110TH NOx Analyzer Getting Started
Teledyne Analytical Instruments 53
1. (Note that the CPU’s COM2 connector is not used in Multidrop)
 J4 on the Multidrop/LVDS PCA to J12 on the motherboard
 J1 on the Multidrop/LVDS PCS to the front panel LCD
Figure 3-15: Jumper and Cables for Multidrop Mode
2. (Note: If you are adding an instrument to the end of a previously configured chain,
remove the shunt between Pins 21  22 of JP2 on the Multidrop/LVDS PCA in the
instrument that was previously the last instrument in the chain.)
4. Close the instrument.
5. Referring to Figure 3-16 use straight-through DB9 male  DB9 female cables to
interconnect the host RS232 port to the first analyzer’s RS232 port; then from the
first analyzer’s COM2 port to the second analyzer’s RS232 port; from the second
analyzer’s COM2 port to the third analyzer’s RS232 port, etc., connecting in this
fashion up to eight analyzers, subject to the distance limitations of the RS-232
standard.
6. On the rear panel of each analyzer, adjust the DCE DTE switch so that the green
and the red LEDs (RX and TX) of the COM1 connector (labeled RS232) are both
lit. (Ensure you are using the correct RS-232 cables internally wired specifically for
RS-232 communication; see Table 1-1, “Communication Cables” and Section
3.3.1.8: Connecting the Communications Interfaces, “RS-232 Connection”).