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05509F DCN6409 55
8. DIGITAL COMMUNICATIONS
8.1. Digital Communications Overview
The M465L 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.
All the functions that are available at the front panel of the instrument can also be performed
over the Com port.
8.2. Changing Com Port Hardware Configuration
WARNING - RISK OF ELECTRICAL SHOCK
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 M465L.
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.
NOTE
MODBUS Interface Software for the M465L is available for
download from the TAPI website. Other TAPI software, such as
APICom, does not currently support communications with the
M465L.