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TELEDYNE API
M703E Calibrator Operator’s Manual Operating The M703E over the Serial I/O Ports
7.3. MULTIDROP RS-232 SET UP
The RS-232 multidrop consists of a printed circuit assembly that plugs onto the CN3, CN4 and CN5 connectors
of the CPU card and the cabling to connect it to the calibrator’s motherboard. This PCA includes all circuitry
required to enable your calibrator for multidrop operation. It converts the instrument’s COM1 port to multidrop
configuration allowing up to eight Teledyne Instruments E-Series calibrators or E-Series analyzers to be
connected the same I/O port of the host computer.
Because both of the DB9 connectors on the calibrator’s back panel are needed to construct the multidrop chain,
COM2 is no longer available for separate RS-232 or RS-485 operation; however, with the addition of an Ethernet
Option (option 63, See Section5.2.4 and 7.5) the COM2 port is available for communication over a 10BaseT
LAN.
Rear Panel
(as seen from inside)
CPU Card
Multidrop
PCA
JP2
Cable to
Ethernet
Card
Cable to
Motherboard
Figure 7-3: Location of JP2 on RS232-Multidrop PCA (option 62)
Each calibrator or analyzer in the multidrop chain must have:
One Teledyne Instruments Option 62 installed.
One 6’ straight-through, DB9 male DB9 Female cable (Teledyne Instruments P/N WR0000101) is
required for each calibrator.
To set up the network, for each instrument:
4. Turn the instrument on and change its MACHINE ID code to a unique 4-digit number.
5. Remove the top cover of the instrument and locate JP2 on the multidrop PCA (7-4)
6. Make sure that the jumpers are in place connection pins 9
10 and 11 12.
7. If the instrument is to be the last instrument on the chain, make sure a jumper is in place connecting pins
21
22.
8. If you are adding an instrument to the end of an already existing chain, do not forget to remove JP2, pins
21
22 on the multidrop PCA on the instrument that was previously the last instrument in the chain.
9. Close the instrument.
05744 Rev B 101