Reference Manual Rev 1.13 
Page 14  004R-646-113 
 
Figure 8: RS-232 Long Cable Runs (Ring Network using COM Port) 
 
3.9.2.  RS-485 Serial 
  Remote Display (TA, TB)  
RS485 is recommended for communicating over distances longer than a few 
metres.  Connect TA to RA and TB to RB on the remote display. 
 
 
 
3.10.  Optical Communications  
A temporary infrared communications link can be established between the 
instrument and a PC using an optional cable.  This connection can be used to 
transfer setup and calibration information from a PC or to download software 
upgrades.     
The PC end of the cable is a standard female DB9 RS232 connector.  The 
instrument end of the cable attaches to the left side of the instrument display.   
WARNING 
The optical coupling head contains a strong magnet and should not be placed 
near any magnetic storage media (eg. credit cards, floppy disks etc.)