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TELEDYNE API
M703E Calibrator Operator’s Manual Operating The M703E over the Serial I/O Ports
7.4. RS-485 CONFIGURATION OF COM2
As delivered from the factory, COM2 is configured for RS-232 communications. This port can be re-configured
for operation as a non-isolated, half-duplex RS-485 port capable of supporting up to 32 instruments with a
maximum distance between the host and the furthest instrument being 4000 feet. If you require full-duplex or
isolated operation, please contact Teledyne Instruments Customer Service.
To reconfigure COM2 as an RS-285 port set switch 6 of SW1 to the ON position (see Figure 7-6).
The RS-485 port can be configured with or without a 150 Ω termination resistor. To include the resistor,
install jumper at position JP3 on the CPU board (see Figure 7-6). To configure COM2 as an un-
terminated RS-485 port leave JP3 open.
SW1
Pin 6
CN5
COM2 – RS-485
JP3
CN4
COM2 – RS-232
CN3
COM1 – RS-232
Figure 7-5: CPU card Locations of RS-232/485 Switches, Connectors and Jumpers
05744 Rev B 103