Specifications
Serial Interface: Signal Ground and Frame Ground (JB5):
This jumper applies to the serial interface. In position 1 and 2, this jumper links the Signal Ground (SGND) line (Pin 5) of both serial lines to the interface module's frame ground (FGND). When this jumper is in positions 2 and 3, Pin 5 of both lines are
disconnected ("lifted") from frame ground.
JB5:
Positions 1 and 2 = SGND and FGND Connected
Positions 2 and 3 = SGND and FGND Not Connected (default)
DSR tracks DTR (JB6 and JB7):
These jumpers MUST be left in their default positions. Because the interface module is designed to work with a whole family of products, and not just the Async Line Driver Card, it is capable of supporting some functions that are not used by the Async
Line Driver Card. Some products in this family might require these jumpers to be set differently, but the Async Line Driver Card might malfunction if either of these jumpers is in the wrong position. Make sure the jumper is placed across Pins 1 and 2.
DO NOT place the jumper across Pins 2 and 3.
JB6 and JB7:
Positions 1 and 2 = DSR Tracks DTR (default)
Positions 2 and 3 = N/A
INSTALLATION:
This chapter describes the functions of the MicroRacks, tells how to install the front and rear modules of the Mini Driver Cards in them, and provides diagrams for wiring the interface connections correctly.
The MicroRacks: An Overview:
Mini Driver Cards are designed to be installed in our MicroRacks (product codes RM202 for 2-card models, RM204 for the 4-card models, RM208 for the 8-card models, and RM216 for the 16-card models). You will install Mini Driver Cards in any MicroRack the
same way. As an example of these products, the MicroRack 16, features sixteen slots for short-range modem cards, plus its own power supply. Measuring only 3.5" (8.9 cm) high, the MicroRack 16 is designed to occupy only 2U in a 19" rack. Sturdy front handles
allow the MicroRack 16 to be extracted and transported conveniently.
The MicroRack's Power Supply:
The power supply included with the MicroRacks uses the same mid-plane architecture as the line-driver cards. Slide the front module of the power supply into the MicroRack from the front, and slide the rear module in from the rear. The two modules plug into one
another in the middle of the rack. Secure the front module with thumbscrews and the rear module with conventional metal screws; these screws and thumbscrews come with the rack.
Switching the Power Supply On and Off:
The MicroRack's Power switch is located on the power supply's front panel. When the MicroRack is plugged in and switched on, the power supply will light the red LED on its front panel. Since the MicroRack is a "hot-swappable" rack, you don't have to
install any cards before switching on the power supply. Also, the power supply may be switched off at any time without harming the installed cards, and you can install or remove cards without turning off the power supply. However, you should always
unplug the power cord before removing, replacing, or switching the power supply or its fuses.
Replacing the Power Supply's Fuse:
The MicroRack's power supply uses a 400-mA fuse for 120-VAC circuits, and a 200-mA fuse 240-VAC circuits. The fuse compartment is located just below the AC socket on the power supply's rear module. To replace the fuse, follow these steps:
1. Making sure the rack is turned off and unplugged, use a small screw-driver to pop the compartment open: It will slide open like a drawer.
2. Notice that there are two fuses in the compartment: The rear fuse is "active", and the front fuse is the "spare".
3. If the active fuse appears to be blown, remove it from the clips and replace it with the spare from the front of the compartment. Note the size and rating of the blown fuse before discarding it.
4. Order a new replacement fuse. Both the 400-mA fuses (Littelfuse 239.400 or equivalent) and the 200-mA fuses (Littelfuse 239.200 or equivalent) measure 5 x 20 mm.
CAUTION:
For continued protection against the risk of fire, replace
blown fuses only with fuses of the same type and rating.
Switching the Power Supply Between 120 and 240 Volts:
Although the MicroRack is shipped from the factory with a customer-specified power-supply configuration, you may change the configuration yourself. Follow these steps to switch the configuration of the power supply between 120 VAC and 240 VAC.
1. Making sure the rack is turned off and unplugged, remove the power supply's front module and locate the two-position switch (labeled either "110/220" or "115/230") near the back of the card. Slide the switch to the setting
corresponding to your desired voltage.
2. Replace the existing fuses with fuses of the correct type.
3. If necessary, replace the power-supply cord with a country-specific cord. (For certain countries, your supplier might be able to give you a special quote on country-specific cords). Plug the cord back in.