SeaLevel MIL-188-C User manual

MIL-188-C / MIL-188-114
SERIAL ADAPTER
USER MANUAL
PART # 3202
SECTIONS:
1. INSTALLATION
2. ADDRESS SELECTION
3. OPTION SELECTION
SOFTWARE INSTALLATION
4. TECHNICAL DESCRIPTION
5. SPECIFICATIONS
6. WARRANTY
FIGURES:
1. ADDRESS SELECTION TABLE
2. DIP SWITCH ILLUSTRATION
3. HEADER E2 (IRQ) ILLUSTRATION
4. HEADER E4 (MULTI-IRQ) ILLUSTRATION
5. MIL-188-114 PIN-OUT
6. MIL-188-C PIN-OUT
7. SILK-SCREEN
8. SCHEMATIC
SEALEVEL SYSTEMS INCORPORATED
PO BOX 830
155 Technology Place
LIBERTY SC 29657 USA
[phone] FAX [phone]
© COPYRIGHT 1993 SEALEVEL SYSTEMS INCORPORATED

1
SECTION 1. INSTALLATION
The MIL-188-C / MIL-188-114 adapter can be installed in any of the PC expansion slots
except J8 on the original IBM "XT" and Portable. Remove the PC case, remove the blank
metal slot cover, and insert the board. Replace the screw, replace the cover, and the
installation is complete.
Be Sure To Set The Address And Jumper Options Before Installation.
SECTION 2. ADDRESS SELECTION
The serial port on the MIL-188 adapter occupies 8 consecutive I/O locations. Dip-switch SW1
sets the base address for the serial port. Be careful when selecting the base address as
some selections conflict with existing PC ports. The following table shows several examples
that usually do not cause a conflict.
ADDRESS BINARY SWITCH POSITION SETTING:
Hex A9 A0 1234567
280-287 1010000XXX OFF ON OFF ON ON ON ON
2A0-2A7 1010100XXX OFF ON OFF ON OFF ON ON
2E8-2EF 1011101XXX OFF ON OFF OFF OFF ON OFF
2F8-2FF 1011111XXX OFF ON OFF OFF OFF OFF OFF
3E8-3EF 1111101XXX OFF OFF OFF OFF OFF ON OFF
300-307 1100000XXX OFF OFF ON ON ON ON ON
328-32F 1100101XXX OFF OFF ON ON OFF ON OFF
3F8-3FF 1111111XXX OFF OFF OFF OFF OFF OFF OFF
TYPICALLY COM1: = 3F8h; COM2: = 2F8h; COM3: = 3E8h; COM4: = 2E8h.
FIGURE 1
ADDRESS SELECTION TABLE
The following illustration shows the correlation between the dip-switch setting and the address
bits used to determine the base address. In the example below, the address 300 Hex through
307 Hex is selected. 300 Hex =11 0000 0XXX In binary representation.
FIGURE 2
DIP-SWITCH ILLUSTRATION
NOTE: Setting the switch "On" or "Closed" corresponds to a "0" in the address, while leaving
it "Off" or "Open" corresponds to a "1".

2
SECTION 3. OPTION SELECTION
The board contains several jumper straps for each port. These jumper straps must be set for
proper operation.
PORT ENABLE / DISABLE
Each port on the MIL-188-C / MIL-188-114 adapter can be enabled or disabled with switch
position 8 on the dip-switch. The port is enabled with the switch "On" or "Closed" and
disabled when "Off" or "Open". If any port is disabled, be sure to also disable the interrupt
request for that port by removing the IRQ jumper (see Figure 3).
INTERFACE SELECTION:
E1: Determines whether the receiver interface is MIL-188-C single-ended unbalanced,
or MIL-188-114 balanced differential. With the jumpers at E1 installed, MIL-188-C
is selected, and the inverting receiver input is grounded. With the jumpers
removed, or floating on one pin, the MIL-188-114 differential interface is selected.
NOTE: You must either install or remove all four jumpers. Any other combination of
jumpers (i.e. one on three off) is not a valid combination and can cause erratic
data.
E2: These headers select the interrupt request for each serial port. If COM1: is
selected, this jumper must be on the IRQ4 setting. If COM2: is selected, this
jumper must be on IRQ3.
NOTE:Most communications software applications default COM3: to IRQ4 and COM4: to
IRQ3. This requires the sharing of interrupts between COM1: and COM3:, and
between COM2: and COM4:. While this is the default, it is not always the preferred
setting. Check your software configuration instructions to determine the
most appropriate IRQ selection.
FIGURE 3
HEADER E2 ILLUSTRATION (IRQ 4 SELECTED)
Any two or more ports can share a common IRQ by placing the jumpers on the same IRQ
setting and setting the appropriate selections at E4. Consult your particular software for IRQ
selection. If no interrupt is desired, remove the jumper.
NOTE: IRQ 2 on "AT" class machines is not available . IRQ 9 is substituted in place of
IRQ 2. To select IRQ 9 place jumper on the IRQ 2 position.

3
Operating System Installation
For Windows Users
Start by choosing Install Software at the beginning of the CD. Choose
Asynchronous COM: Port Software, SeaCOM.
Other Operating Systems
Refer to the appropriate section of the Serial Utilities Software.

4
E4: "N" indicates the (N)ormal, single interrupt per port mode. The "S" indicates the
(S)hared interrupt mode, which allows more than one port to access a single IRQ.
The "M" indicates the inclusion of a 1K ohm pull-down resistor required on one port
when sharing interrupts.
FIGURE 4
HEADER E4 (shown in normal mode) ILLUSTRATION
Set jumpers to "N" for single interrupt mode. This setting is the normal setting for most
applications.
Set jumpers to "S" for shared interrupt mode for all ports sharing an IRQ except one. Set that
port block for "M". This provides the pull-down resistor circuit that makes sharing of IRQ's
possible. If you are using more than one MIL-188-C / MIL-188-114 adapter or a
compatible card in a bus you should only have one port set to "M".
Set jumper to "S" if you are using more than one 3202 in a bus or you wish to completely
remove the pull-down resistor for hardware compatibility. Setting the board in this
configuration when it is not accompanied by a pull-down resistor will prevent the ports
from triggering an interrupt.
SECTION 4. TECHNICAL DESCRIPTION
The MIL-188-C / MIL-188-114 Serial Interface adapter (Part #3202) provides one asynchronous
serial port with the MIL-188-C (Single Ended) or MIL-188-114 (Differential) communications
standard interface. These interfaces are commonly used by military equipment for highly
reliable data communications. This board provides jumper selectable options for the MIL-188-
C or MIL-188-114 interface.
Features Include:
•The serial port can be addressed as COM1: through COM4: or any other I/O address up
to 3FF Hex
•IRQ lines are jumper selectable for IRQ 2-7,10,11,12, AND 15
•Interrupts can be shared with other "Share-Able" IRQs
•Interface supports the following signals: TD, RD, RTS, CTS, DSR, DCD, DTR
•RS-530 DTE pin-out implemented
•DB-25P (male) connector mounted on board bracket
•MIL-188-C or MIL-188-114 is determined by jumper selection
•Part # 3202
The MIL-188-C / MIL-188-114 adapter utilizes the same 16450 UART chip found in the IBM
asynchronous adapter. This chip features programmable baud rate, data format, and interrupt
control. Refer to the IBM Technical Reference for details on programming this chip. The serial
port can be set as COM1: or as COM2:, or as any other I/O address, providing total
compatibility with most communications software and languages. MIL-188 compatible drivers
and receivers are provided on the serial port.

5
MIL-188 SPECIFICATIONS
Voltage levels
MIL-188-C single ended input uses positive true logic. The normally idle, or marking, line is
represented as +5 volts output. The start bit, or space condition, causes the output to switch
to -5 volts.
MIL-188-114 differential transmission utilizes two wires per signal. Signal voltage is at +5,
while the other signal voltage is at -5 volts.
LINE TERMINATION
Each receiver is terminated in a 180 ohm resistor. The drivers have 10 ohm current limiting
resistors in series with the output signal for protection.
SIGNAL NAME PIN # MODE
GND Ground 7
RDB RX+ Receive Positive 16 Input
RDA RX-Receive Negative 3Input
CTSB CTS+ Clear To Send Pos. 13 Input
CTSA CTS-Clear To Send Neg. 5Input
DSRB DSR+ Data Set Ready Pos. 22 Input
DSRA DSR Data Set Ready Neg. 6Input
DCDB DCD+ Data Carr. Detect Pos. 10 Input
DCDA DCD-Data Carr. Detect Neg. 8Input
TDB TX+ Transmit Positive 14 Output
TDA TX-Transmit Negative 2Output
RTSB RTS+ Req. To Send Pos. 19 Output
RTSA RTS-Req. To Send Neg. 4Output
DTRB DTR+ Data Term. Ready Pos. 23 Output
DTRA DTR-Data Term. Ready Neg. 20 Output
FIGURE 5
MIL-188-114 PIN-OUT
SIGNAL NAME PIN # MODE
GND Ground 7
RDB RX+ Receive Positive 16 Input
CTSB CTS+ Clear To Send Pos. 13 Input
DSRB DSR+ Data Set Ready Pos. 22 Input
DCDB DCD+ Data Carr. Detect Pos. 10 Input
TDB TX+ Transmit Positive 14 Output
RTSB RTS+ Req. To Send Pos. 19 Output
DTRB DTR+ Data Term. Ready Pos. 23 Output
FIGURE 6
MIL-188-C PIN-OUT

6
SECTION 5. SPECIFICATIONS
ENVIRONMENTAL SPECIFICATIONS
Specification Operating Storage
Temperature range 0 -50 Degrees C
32 -122 Degrees F -20 -70 Degrees C -40 -100 Degrees F
Humidity Range 0-90% R.H.
Non-Condensing 0-90% R.H. Non-Condensing
PERFORMANCE SPECIFICATIONS
MTBF > 150,000 Hours
MTTR < .25 Hours
Turnaround For Repair -5 Working Days
MANUFACTURING SPECIFICATIONS
•IPC 610-A Class-III standards adhered to with a 0.1 visual A.Q.L. and 100% Functional
Testing.
•Boards are built to U.L. 94V0 rating and are 100% Electrically tested. Boards are
Solder Mask over bare Copper or Solder Mask over Tin Nickel.
POWER SPECIFICATIONS
SUPPLY LINE +5Vdc -5Vdc
RATING(mA) 750 85
SECTION 6.WARRANTY
Sealevel Systems, Inc. provides a lifetime warranty for this product. Should this
product fail to be in good working order at any time during this period, Sealevel
Systems will, at it's option, replace or repair it at no additional charge except as set
forth in the following terms. This warranty does not apply to products damaged by
misuse, modifications, accident or disaster.
Sealevel Systems assumes no liability for any damages, lost profits, lost savings or
any other incidental or consequential damage resulting from the use, misuse of, or
inability to use this product. Sealevel Systems will not be liable for any claim made
by any other related party.
Return authorization must be obtained from Sealevel Systems before returned
merchandise will be accepted. Authorization can be obtained by calling Sealevel
Systems and requesting a Return Merchandise Authorization (RMA) Number.
Sealevel Systems Incorporated
P.O. BOX 830
155 Technology Place
Liberty, SC 29657 USA
[phone] FAX [phone]
MIL-188-C / MIL-188-114 Serial I/O adapter is a trademark of Sealevel Systems Incorporated.
IBM and "AT" are trademarks of the International Business Machines Corporation.