VXi EX7000 User Manual

VXI Technology, Inc. 

36 

EX7000 Series Web Page Operation 

RDBs can either be commanded one board at a time or several RDBs may be commanded 
simultaneously. The RDB has 72 relay control drive lines capable of sinking 200 mA and twelve 
very high-current reset lines capable of sinking 800 mA. They are divided into three banks, each 
can be powered separately. Each bank consists of four 20-pin connectors. Each connectors 
consists of: 

•  six high-current drive lines 

•  six indicator/status bits 

•  one very high-current reset line 

•  four relay ID bits 

•  one relay power input 

•  one 5 V input 

•  one ground 

NOTE 

All devices connected to a particular bank (i.e. group of four connectors) must be of the same 
type: continuous or latching. Mixing of different type may result in erratic behavior and damage to 
overall system. 

The EX7300 and EX7400 relay drive connectors reside on a  (RDBs) that are partitioned into three 
banks: J2 through J5 constitute bank 0, J6 through J10 bank 1, and J11 through J14 bank 2. 
Although a single RDB may contain both latching and non-latching devices, the banks may only 
contain one type of device. For example, if J2, J3, and J4 are connected to non-latching devices, J5 
may only contain a non-latching relay. A latching relay could, however, be installed in J6. 

J13

J12

Some connectors have been removed for clarity.

J9

J8

J7

J6

J5

J4

J11

J10

J3

J2

 

 

 

Additionally, the RDB of the EX7300 and EX7400 may have varying quantities of open-collector 
and TTL drive lines, depending on the model ordered. This property is linked to the relay drive 
connector banks, as illustrated in Figure 5-2. The following table indicates how banks are used 
according the part number assigned.