User's Guide

User’s Guide Multipurpose Interface Board
2110059 Rev 1.0 Proprietary and Confidential Page 93
Serial Signals
The MIB converts the serial communication signals to RS-232 level, presents them at the Serial
Breakout Box and then passes them to the DTE/DCE ends.
The DCE (modem) side of this conversion can be disabled, effectively disconnecting the modem
from the MIB by placing a jumper on the MODEM DISBL pins of the main jumper block. This
can be useful if you are using a protocol analyzer to emulate the DCE device.
Input Signals
The 5V power comes from the MIB via the jumper J21 (Power Select). Pins 1 – 2 will connect the
MIB adjustable 5V supply.
All other input signals (Shutdown (\SHDN) and status inputs 1 – 4) to the modem are supplied
from the main jumper block. Placing a jumper on the pins will make the signal active.
Output Signals
The three modem \STATUS_OUT signals are indicated by the three LEDs (SO1, SO2, SO3).
These are lit when the output signal is active (low).
10.4.5. SB302 Modem Connection
The SB302 uses a 2x8 pin connector block. A strap with connectors at each end (part
number 2000067) is provided with the OEM Developer’s Kit. This strap allows connection of the
modem to the MIB at J7 (To SB301/302).
Serial Signals
The MIB converts the serial communication signals to RS-232 level, presents them at the Serial
Breakout Box and then passes them to the DTE/DCE ends.
The DCE (modem) side of this conversion can be disabled, effectively disconnecting the modem
from the MIB by placing a jumper on the MODEM DISBL pins of the main jumper block. This
can be useful if you are using a protocol analyzer to emulate the DCE device.
Input Signals
The 5V power and Shutdown (\SHDN) signal to the modem can be supplied from either the MIB
or the Host (DTE) connection (not the PC Host RS-232 connection).
Modem power can be drawn from either the MIB or the host (DTE) by setting the jumper J21
(Power Select). Pins 1 – 2 will connect the MIB adjustable 5V supply. Pins 2 –3 (+5V Host) will
connect the host power to the modem. See Section 10.3.2 for details.
The Shutdown (\SHDN) signal must originate from the Host (DTE) connection (not the PC Host
RS-232 connection). It can be enabled or disabled via a jumper (HOSTSHDN). With the jumper
connector in, the shutdown signal will be passed to the modem. With the jumper removed, the
signal is blocked.
The Shutdown signal can also be originated at the MIB using the SB3XX SHDN jumper on the
main jumper block. Placing a jumper on the pins will make the signal active (low).
Output Signals
The three modem \STATUS_OUT signals are passed directly between the modem and the Host
(DTE) connector. Their status is also indicated by the three LEDs (SO1, SO2, SO3). These are lit
when the output signal is active (low).
10.4.6. SB220 Modem Conneciton
This is provided for factory testing of older model modems not detailed in this manual.