CyberResearch RS-232 Manuale Utente

 

©Copyright 2001 CyberResearch, Inc. 

 
 

The COMT 366 is designed to interface EIA-232 with RS-485 equipment. The EIA-232 
device can be either a DTE or DCE type device. The DTE/DCE selector switch allows 
for reversing Pins 2 and 3 ( TD and RD), thereby eliminating the need for null modem 
cables. If the switch is in the DTE position, Pin 2 of the RS-232 connector is an output 
for the COMT 366.  

The half-duplex nature of RS-485 allows for a Master-Slave configuration. In a network, 
the master will poll the slaves through the single twisted pair and request that only one 
device access the line at a time. 
 
The COMT 366 can operate at the following Baud rate/distance combinations: 
 

Baud rate: 

 

38.4 K 

 

19.2K 

 

9.6K and below 

 

Distance (ft.) 

 

4000 

 

6000 

 

18000 

 

 

Two pairs of screw terminals are provided to allow the pass through of the twisted pair. 
This simplifies installation of a network. There are internal connections between both 
positive and both negative terminals.  

The COMT 366 can be interfaced to the network bus in two configurations. However, the 
results of both configurations are identical. The first configuration allows for a direct 
splice into the bus. The second configuration creates a "T" at the bus and runs a stub of 
wire to the unit.