Multidrop Rs-232 Setup - Teledyne T360 Operation Manual

Operating Instructions

4.11.8. Multidrop RS-232 Setup

Printed circuit assemblies (PCAs) are sensitive to electro-static discharges too small to be
felt by the human nervous system. Damage resulting from failure to use ESD protection
when working with electronic assemblies will void the instrument warranty. See A Primer on
Electro-Static Discharge section in this manual for more information on preventing ESD
damage.
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When the RS-232 Multidrop option is installed, connection adjustments and
configuration through the menu system are required. This section provides
instructions for the internal connection adjustments, then for external
connections, and ends with instructions for menu-driven configuration.
Note that because the RS-232 Multidrop option uses both the RS232 and COM2
DB9 connectors on the analyzer's rear panel to connect the chain of instruments,
COM2 port is no longer available for separate RS-232 or RS-485 operation.
CAUTION – Risk of Instrument Damage and Warranty Invalidation
In each instrument with the Multidrop option there is a shunt jumpering two pins
on the serial Multidrop and LVDS printed circuit assembly (PCA), as shown in
Figure 4-9. This shunt must be removed from all instruments except that
designated as last in the multidrop chain, which must remain terminated. This
requires powering off and opening each instrument and making the following
adjustments:
1. With NO power to the instrument, remove its top cover and lay the rear panel
open for access to the multidrop PCA, which is seated on the CPU.
2. On the Multidrop/LVDS PCA's JP2 connector, remove the shunt that jumpers
Pins
21  22 as indicated in Figure 4-9. (Do this for all but the last instrument in
the chain where the shunt should remain at Pins 21  22).
3. Check that the following cable connections are made in all instruments (again
refer to Figure 4-9).
 J3 on the Multidrop/LVDS PCA to the CPU's COM1 connector
(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
Teledyne API Model T360/T360M Operation Manual
07272B DCN6552