MVME162-211 Processor

MVME162-211 Processor

Port B is routed (via the module at J10) to the 25-pin DB25 connector marked

SERIAL PORT 2 on the MVME162 front panel. Port B is also routed to a DB9 (on

the MVME712x) or DB25 (on the MVME712M) connector on the MVME712

series transition module. It is identified there as Port 4.

Although both ports are connected to the same Z85230 Port B, there are several

considerations to keep in mind:

❏ On the MVME162 front panel, Port 2 can be connected to the TxC and RxC

clock signals which may be present on the DB25 connector. These

connections are made via header J12 on the MVME162 board (see Figures

2-3, 2-4, and 2-5 in Chapter 2). The TxC and RxC clock lines are also

available at Port 4 on MVME712M transition modules.

❏ On MVME712x transition modules, Port 4 is hard-wired as an EIA-232-D

DB9 DTE serial port. A ‘‘null modem’’ cable is necessary to use it as a DCE

port.

❏ On MVME712M transition modules, Port 4 can be configured as either a

DTE or DCE EIA-232-D serial port via jumper headers J19 and J18 on the

MVME712M. Port 4 can also be connected to the TxC and RxC clock

signals which may be present on the DB25 connector. These connections

are made via header J15 on the MVME712M (see Figure 2-3, sheets 3-6 in

Chapter 2).

❏ When Port B is configured as an EIA-530 interface, EIA-530 data transfers

normally occur through serial port 2 on the MVME162 front panel. The

MVME712 series transition module should be disconnected from the

MVME162.