Emerald-MM-8
8-Port RS-232/RS-422/RS-485 PC/104 Module
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Description |
Now with higher density than ever, our new Emerald-MM-8 gives you 8 serial ports on a single PC/104 module. Each version of the board provides 8 serial ports operating at speeds up to 460.8kbps. Several versions are available:
| EMM-8M-XT |
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8 ports RS-232/422/485 user selectable |
| EMM-8232-XT |
8 ports fixed RS-232 (low-cost version) |
In RS-232 mode, the full complement of standard PC serial port signals (8 signals + ground) are provided for each port. In RS-422 mode, Signals RX+, RX-, TX+, and TX- are provided, along with ground. In RS-485 mode, signals TX+/RX+ and TX-/RX- are provided, along with ground. Ports are grouped 4 per 40-pin I/O header. Ports 1-4 are on the right, and ports 5-8 are on the left.
Two 16C654 quad serial port ICs are used for the serial ports. This chip supports data rates up to 460.8kbps and contains a 64-byte transmit and receive FIFOs for each port to minimize processor overhead.
Fully Programmable Serial Ports
All serial port address and interrupt level settings may be done in software. On power up, the serial ports are disabled. After programming the address and interrupt settings, the ports are enabled by setting a bit in an auxiliary control register. For applications that require the ports to be operating without user software intervention, the board provides 4 different hardware configurations.
Full Interrupt Sharing
Interrupt levels are individually programmable for each port. The available interrupt levels are 2, 3, 4, 5, 6, 7, 10, 11, 12, and 15. In addition, a 1K Ohm pulldown resistor is provided for each port and is selected with a jumper. Any number of ports can share the same interrupt level. And if you have two boards in one system, both boards can share the same interrupt level as well. An interrupt status register is provided to indicate the status of each serial port's interrupt request signal. This register is especially useful in Windows NT.
8 Digital I/O Line
Emerald-MM-8 has 8 programmable digital I/O lines. Each line can be independently programmed for input or output.
Designed for the Embedded World
Another distinguishing feature of Emerald-MM is its low-power +5V only operation. This board needs absolutely no +12V or -12V to operate. Extended temperature operation (-40 to +85°C) is also standard.
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Flexible Configuration |
Emerald-MM-8 provides a 4-byte register map that provides access to all the board's features. The address of this map is selected with jumpers. Programming of the I/O addresses and interrupt levels of the 8 ports is then done through these registers:
| Base + Write |
Function |
Read Function |
| 0 |
Select address or interrupt register to write |
Read back selected register no. |
| 1 |
Write address or interrupt to selected register |
Read back port 1 address (diagnostic) |
| 2 |
Digital I/O direction register |
Interrupt status register |
| 3 |
Digital output register |
Digital input register |
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I/O Headers |
Emerald-MM-8 has two 40-pin I/O headers with two serial ports on each header. These headers mate with standard ribbon cable connectors. Our cable no. C-DB9M-4 provides a 40-pin IDC connector at one end to mate with the pin headers on the board, and it has four DB-9 male connectors at the other end with the standard PC serial port pinout. Each cable handles four ports; two cables provide access to all eight ports on the board.
The pinouts shown below apply to any port when in the stated mode. Depending on which version of the board you have, certain pinouts may not apply. Please note that for simplicity only ports 1 through 4 are shown, and all ports are shown in the same configuration. However each port can be configured independently.
| DCD 1 |
1 |
2 |
DSR 1 |
| RXD 1 |
3 |
4 |
RTS 1 |
| TXD 1 |
5 |
6 |
CTS 1 |
| DTR 1 |
7 |
8 |
RI 1 |
| GND |
9 |
10 |
DIO 1 |
| DCD 2 |
11 |
12 |
DSR 2 |
| RXD 2 |
13 |
14 |
RTS 2 |
| TXD 2 |
15 |
16 |
CTS 2 |
| DTR 2 |
17 |
18 |
RI 2 |
| GND |
19 |
20 |
DIO 2 |
| DCD 3 |
21 |
22 |
DSR 3 |
| RXD 3 |
23 |
24 |
RTS 3 |
| TXD 3 |
25 |
26 |
CTS 3 |
| DTR 3 |
27 |
28 |
RI 3 |
| GND |
29 |
30 |
DIO 3 |
| DCD 4 |
31 |
32 |
DSR 4 |
| RXD 4 |
33 |
34 |
RTS 4 |
| TXD 4 |
35 |
36 |
CTS 4 |
| DTR 4 |
37 |
38 |
RI 4 |
| GND |
39 |
40 |
DIO 4 |
RS-422 Mode
| N/C |
1 |
2 |
N/C |
| TXD+ 1 |
3 |
4 |
TXD- 1 |
| GND |
5 |
6 |
RXD- 1 |
| RXD+ 1 |
7 |
8 |
N/C |
| GND |
9 |
10 |
DIO 1 |
| N/C |
11 |
12 |
N/C |
| TXD+ 2 |
13 |
14 |
TXD- 2 |
| GND |
15 |
16 |
RXD- 2 |
| RXD+ 2 |
17 |
18 |
N/C |
| GND |
19 |
20 |
DIO 2 |
| N/C |
21 |
22 |
N/C |
| TXD+ 3 |
23 |
24 |
TXD- 3 |
| GND |
25 |
26 |
RXD- 3 |
| RXD+ 3 |
27 |
28 |
N/C |
| GND |
29 |
30 |
DIO 3 |
| N/C |
31 |
32 |
N/C |
| TXD+ 4 |
33 |
34 |
TXD- 4 |
| GND |
35 |
36 |
RXD- 4 |
| RXD+ 4 |
37 |
38 |
N/C |
| GND |
39 |
40 |
DIO 4 |
RS-485 Mode
| N/C |
1 |
2 |
N/C |
| TX/RX+ 1 |
3 |
4 |
TX/RX- 1 |
| GND |
5 |
6 |
N/C |
| N/C |
7 |
8 |
N/C |
| GND |
9 |
10 |
DIO 1 |
| N/C |
11 |
12 |
N/C |
| TX/RX + 2 |
13 |
14 |
TX/RX- 2 |
| GND |
15 |
16 |
N/C |
| N/C |
17 |
18 |
N/C |
| GND |
19 |
20 |
DIO 2 |
| N/C |
21 |
22 |
N/C |
| TX/RX+ 3 |
23 |
24 |
TX/RX- 3 |
| GND |
25 |
26 |
N/C |
| N/C |
27 |
28 |
N/C |
| GND |
29 |
30 |
DIO 3 |
| N/C |
31 |
32 |
N/C |
| TX/RX+ 4 |
33 |
34 |
TX/RX- 4 |
| GND |
35 |
36 |
N/C |
| N/C |
37 |
38 |
N/C |
| GND |
39 |
40 |
DIO 4 |
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Specifications |
| Serial Ports |
| Number of serial ports |
8 |
| Protocol |
RS-232, RS-422, and/or RS-485
depending on version |
| Maximum baud rate |
460.8kbps |
| Communications parameters |
5, 6, 7, or 8 data bits;
Even, odd, or no parity |
| Base address options |
Programmable |
| Interrupt level options |
Programmable; select from levels 2 (9), 3, 4, 5, 6, 7, 10, 11, 12, 15 |
| RS-232 Characteristics: |
| Input voltage swing |
±30V maximum |
| Input thresholds |
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| Logic 0: |
0.8V min |
| Logic 1: |
2.4V max |
| Input impedance |
3KΩ minimum |
| Output voltage swing |
±5V min, ±7V typical |
| Output resistance |
300Ω minimum |
| RS-422/RS-485 Characteristics: |
| Differential input threshold |
-0.2V min, +0.2V max |
| Input impedance |
12KΩ minimum |
| Input current |
+1.0µA max (VIN = 12V)
-0.8µA max (VIN = -7V) |
| Differential output voltage |
2.0V min (RL=50Ω) |
| High/low states differential output voltage symmetry |
0.2V max differential |
| General |
| Short circuit protection |
All outputs protected against continuous short circuit |
| I/O header |
2 40-position (2x10) .025" square pin header on .1" centers;
Headers mate with standard ribbon cable (IDC) connectors |
| Dimensions |
3.55" x 3.775" |
| Weight |
2.60z / 74g |
| Power supply |
+5VDC ±10% |
| Current consumption |
80mA typical, all outputs open |
| Operating temperature |
-40 to +85°C standard, all versions |
| Operating humidity |
5% to 95% noncondensing |
| PC/104 bus |
8-bit and 16-bit bus headers are used (16-bit header is used for interrupt levels only) |
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Get an online quote |
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Emerald-MM-8 |
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| Emerald-MM 8-ch RS-232/422/485 extended temp. |
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| EMM-8 Development Kit (Web orders only); Includes EMM-8M-XT board and qty 2 C-DB9M-4 cables |
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Cables and accessories |
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| Cable, 4 DB9M to 1 IDC40, 18 inches (for Hercules II and EMM-8) (uses 2) |
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Copyright© Diamond Systems Corporation 2001-2008. All rights reserved.
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US: 1·800·36·PC104 
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