Connecting A Peripheral To A Dec423 Mmj Port - Digital Equipment DECsystem 5100 Installation Manual

4.7.1 Connecting a Peripheral to a DEC423 MMJ Port
Your DECsystem 5100 has a minimum of three MMJ ports. MMJ port 3 is
reserved for the console terminal. Use any of the other two MMJ ports to
connect peripherals.
The optional DHT80 asynchronous module (if installed) provides a further
seven MMJ ports.
The following procedure describes how to connect a peripheral to one of the
MMJ ports on the back of the system unit:
Note Some peripheral cables have grounding straps. You must connect these
grounding straps to the grounding stud closest to the port that you are using.
Turn off the DECsystem 5100 and the peripheral, by setting the on/off
switches to the off
(0)
position.
2
Choose an unused MMJ port. If you are using all the MMJ ports, and
you have a DEC423 to RS232 adapter, you can convert one of the modem
ports to an MMJ port. Use steps 2, 3, and 4 of the procedure outlined
in Section 4. 7 .2 to connect the adapter, then return to this procedure at
step 3.
3 Press the MMJ connector, on the peripheral cable, into the chosen MMJ
port until the tab on the connector clicks.
4 Turn on the peripheral by setting its on/off switch to the on ( I ) position.
5
Turn on the DECsystem 5100 by setting its on/off switch to the on (I)
position.
Figure 4-7 shows how to connect an MMJ cable to MMJ port 8 on the DHT80
asynchronous module.
4-12 Installing Peripheral Devices