Teledyne Photo Scanner 703E 用户手册

 

The M703E is equipped with two serial communication ports located on the rear panel accessible via 2 DB-9 
connectors on the back panel of the instrument (See Figure 3-2).  The COM1 connector is a male DB-9 
connector and the COM2 is a female DB9 connector.   

Both ports operate similarly and give the user the ability to communicate with, issue commands to, and receive 
data from the calibrator through an external computer system or terminal.     

  The RS-232 port (COM1) can also be configured to operate in single or RS-232 multidrop mode (option 

62; See Section 5.2.3 and7.3.   

  The COM2 port can be configured for standard RS-232 operation, half-duplex RS-485 communication or 

for access via an LAN by installing the Teledyne Instruments’ Ethernet interface card (see Section 5.2.4 
and 7.5). 

 

RS-232 was developed for allowing communications between data terminal equipment (DTE) and data 
communication equipment (DCE).  Basic data terminals always fall into the DTE category whereas modems are 
always considered DCE devices.   

Electronically, the difference between the DCE & DTE is the pin assignment of the Data Receive and Data 
Transmit functions.   

  DTE devices receive data on pin 2 and transmit data on pin 3.  
  DCE devices receive data on pin 3 and transmit data on pin 2. 

A switch located below the serial ports on the rear panel allows the user to switch between DTE (for use with 
data terminals) or DCE (for use with modems).  Since computers can be either DTE or DCE, check your 
computer to determine which mode to use.