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© Sealevel Systems, Inc. 3541 Manual | SL9150 12/2022
Technical Description
The
C4-104.ULTRA
provides 4 RS-232/422/485 software programmable ports from a single PC-104
adapter. The
C4-104.ULTRA
utilizes the 16C864 UART. This chip features programmable baud rates, data
format, interrupt control and industry leading 128-byte transmit and receive FIFOs.
Connector Pin-outs
Port 1
Port 2
P1 Pin #
DB-9
RS-232
RS-422/485
P1 Pin #
DB-9
RS-232
RS-422/485
28
5 GND1
GND1
27
5 GND2
GND2
32
3
TD1
TX1-
23
3
TD2
TX2-
33
7
RTS1
TX1+
22
7
RTS2
TX2+
34
2
RD1
RX1-
21
2
RD2
RX2-
31
8
CTS1
RX1+
24
8
CTS2
RX2+
29
9
RI1
26
9
RI2
30
4
DTR1
25
4
DTR2
35
6
DSR1
20
6
DSR2
36
1 DCD1
19
1 DCD2
Port 3
Port 4
P1 Pin #
DB-9
RS-232
RS-422/485
P1 Pin #
DB-9
RS-232
RS-422/485
10
5 GND3
GND3
9
5 GND4
GND4
14
3
TD3
TX3-
5
3
TD4
TX4-
15
7
RTS3
TX3+
4
7
RTS4
TX4+
16
2
RD3
RX3-
3
2
RD4
RX4-
11
9
RI3
6
8
CTS4
RX4+
12
4
DTR3
8
9
RI4
17
6
DSR3
7
4
DTR4
18
1 DCD3
1
1 DCD4
2
6
DSR4
Pins 37, 38, 39, 40 on the Box Header (P1) are no connects.
Please terminate any control signals that are not going to be used. The most common way to do
this is connect RTS to CTS and RI. Also, connect DCD to DTR and DSR. Terminating these pins, if
not used, will help ensure you get the best performance from your adapter.
