VXI EX7000 user manual Open-Collector Vs. Ttl Drive Lines, 2 RELAY DRIVE CONNECTOR BANKS

VXI Technology, Inc.

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.

OPEN-COLLECTOR VS. TTL DRIVE LINES

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.

Relay Driver Board (RDB)

J13 J11

J12 J10

J9 J7

J8 J6

J5 J3

J4 J2

Some connectors have been removed for clarity. Bank 2 Bank 1 Bank 0

FIGURE 5-2: RELAY DRIVE CONNECTOR BANKS

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.

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