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8.
DIGITAL COMMUNICATIONS
8.1.
Digital Communications Overview
The 465L comes equipped with a digital communications (Com) port that can be
connected to a computer or digital data acquisition system. This Com port uses the
standardized MODBUS® protocol and can be configured for RS232, RS485, or
Ethernet (10 Mbit,) allowing for connections to a wide variety of devices and
networks. See Section 8.2 for more information on configuring the Com port.
The Com port can be used for data acquisition, alarm triggering, and instrument
configuration.
instrument can also be performed over the Com port.
MODBUS Interface Software for the 465L is available for download
from the TAPI website. Other TAPI software, such as APICom, does
8.2.
Changing Com Port Hardware Configuration
HIGH VOLTAGE MAY BE PRESENT WHEN POWER IS CONNECTED TO THE
INSTRUMENT!
THE OPERATIONS OUTLINED IN THIS SECTION ARE TO BE PERFORMED
BY QUALIFIED MAINTENANCE PERSONNEL ONLY!
The Com port can be configured for RS232, RS485, or Ethernet. To change the
Com port hardware configuration, perform the following steps:
1. Disconnect power from the 465L.
2. Remove the six screws and the top cover.
3. Locate the DIP switches labeled SW3 on the rear portion of the mainboard.
4. Turn ON the switches specified for the desired Com configuration (See Figure
8-1.) All other switches on SW3 should be OFF.
5. Locate SW2 (DTE-DCE switch) on mainboard.
6. For RS-232 operation, set SW2 to either DTE or DCE (See Section 8.3.) For
RS-485 operation, set SW2 to DCE.
7. Re-install the instrument cover.
05509G DCN6806
All the functions that are available at the front panel of the
not currently support communications with the 465L.
WARNING - RISK OF ELECTRICAL SHOCK
Teledyne API Model 465L O
NOTE
Monitor Manual
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53
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Troubleshooting
