Fluke 943-227-15 用户手册

2

2-5 

 
Victoreen Communications Loop – 943-227-15VL 

 
Communication between the detector preamplifier and the UDR or 960 controller may be performed via 
Victoreen loop, a serial asynchronous communications interface.  The communication utilizes Victoreen 
protocol and is intended for use in electrically hostile environments where high noise immunity is required.  
Noise immunity is achieved using differential line driving, and electrically isolating the end of each 
transmit/receive pair with opto-isolators.  Using a ±15 Vdc communications power supply, each 0 to 1 
transition is equivalent to a 30-volt swing in loop voltage.  Refer to the Model 942-200-80-1 
Communications Board instruction manual for further information.   
 
Jumper JP1 controls the communication communications method employed.  JP1, A-B selects 

Victoreen 

loop communications. 
 

RS232C Communications – 943-227-15 

 
Communication between the detector preamplifier and the UDR or 960 controller may be performed via 
RS232C serial asynchronous communications interface.  Jumper JP1 controls the communication 
communications method employed.   
 
JP1, B-C selects RS232C communications. 
 
 

2.5  Preamplifier Switch & Jumper Settings 

 
Switch and jumper settings for the preamplifier are summarized in Table 2-7, 2-8, and 2-9. 
 
Table 2-7.  Preamplifier Serial Interface Board 977-210-10M Switch Settings 

SW1 

Open 

Microprocessor Reset switch, momentary contact 

 

 

SW2  

N/A 

Not supplied 

 

 

SW3-1 

ON 

OFF Selects 300 baud  •  1/ON Selects 4800 baud (normal setting) 

SW3-2 

OFF 

OFF •  (No function is implemented in the 977-210-10M) 

SW3-3 

OFF 

OFF Selects Rate Mode (normal)  • (Selects Maintenance Mode for 

factory PGA and Auto Zero set-up only) 

SW3-4 

OFF 

OFF • (No function is implemented in the 977-210-10M) 

 
 

SW3 is a 4-position DIP switch on the 977-210-10M serial 
interface board.