Emerald-MM
4-Port RS-232/RS-422/RS-485 PC/104 Module
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Description |
Our Emerald-MM PC/104 module gives you 4 serial ports operating at speeds up to 115kbps. The board is available in several models with different combinations of jumper-configurable serial protocols:
- EMM-XT 2 ports RS-232, 2 ports RS-232/422/485
- EMM-4485-XT 4 ports RS-422/485
- EMM-4M-XT 4 ports RS-232/422/485
In RS-232 mode, the full complement of standard PC serial port signals (8 signals + ground) are provided for each port and are grouped onto two 20-pin headers (2 ports per header). 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.
A 16C554 quad serial port IC is used for the serial ports. This chip supports data transfer rates up to 115kbps and contains a 16-byte programmable FIFO buffer for each port to minimize processor overhead.
Flexible Configuration
Emerald-MM offers more interrupt level and I/O address options than other quad serial port modules. Therefore, integrating the board into your computer system is a simpler task. Eight different I/O address combinations and 10 different interrupt levels are available.
Full Interrupt Sharing
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.
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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Configuration Options |
I/O Address Selection (Hex)
| Selection |
Port 1 |
Port 2 |
Port 3 |
Port 4 |
Status Register |
| 0 |
3F8 |
2F8 |
3E8 |
2E8 |
220 |
| 1 |
3E8 |
2E8 |
3A8 |
2A8 |
220 |
| 2 |
380 |
388 |
288 |
230 |
224 |
| 3 |
240 |
248 |
260 |
268 |
224 |
| 4 |
100 |
108 |
110 |
118 |
240 |
| 5 |
120 |
128 |
130 |
138 |
244 |
| 6 |
140 |
148 |
150 |
158 |
248 |
| 7 |
160 |
168 |
170 |
178 |
24C |
Interrupt Levels
Interrupt levels are individually selectable 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.
A single interrupt level can be shared by 2, 3, or 4 ports on one board and can even be shared by more than one board in the system. To enable interrupt sharing, set two or more interrupt level jumpers to the same level and pull out all but one pulldown resistor jumper.
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I/O Headers |
Emerald-MM has two 20-pin I/O headers with two serial ports on each header. These headers mate with standard ribbon cable connectors. Our cable no. C-DB9M-18 provides a 20-pin IDC connector at one end to mate with the pin headers on the board, and it has two DB-9 male connectors at the other end with the standard PC serial port pinout. Each cable handles two ports; two cables provide access to all four ports on the board.
| 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 |
N/C |
| 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 |
N/C |
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 |
N/C |
| 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 |
N/C |
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 |
| N/C |
9 |
10 |
N/C |
| 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 |
| N/C |
19 |
20 |
N/C |
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Specifications |
| Serial Ports |
| Number of serial ports |
4 |
| Protocol |
Ports 1 and 2: RS-232, RS-422, RS-485 (jumper selected)
Ports 3 and 4: RS-232 |
| Maximum baud rate |
115kbps standard version
460.8kbps available (-HS option) |
| Communications parameters |
5, 6, 7, or 8 data bits
Even, odd, or no parity |
| Short circuit protection |
All outputs protected against continuous short circuit |
| RS-232 mode: |
| Input impedance |
3KΩ minimum |
| Input voltage swing |
±30V maximum |
| Output voltage swing |
±5V min, ±7V typical |
| RS-422, RS-485 modes: |
| Differential |
-0.2V min, +0.2V max input threshold |
| 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 maximum |
| General |
| I/O header |
2 20-position (2x10) .025" square pin header on .1" center;
Headers mate with standard ribbon cable (IDC) connectors |
| Dimensions |
3.55" x 3.775" |
| Power supply |
+5VDC ±10% |
| Current consumption |
80mA typical, all outputs unloaded |
| Operating temperature |
-40 to +85°C Extended |
| Operating humidity |
5% to 95% noncondensing |
| PC/104 bus |
8-bit and 16-bit bus headers are installed |
| Weight |
2.6oz/74g |
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Order online |
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Emerald-MM |
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Get an online quote |
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Emerald-MM |
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| Emerald-MM 2-ch RS-232/422/485 + 2 ch. RS-232 Extended Temperature |
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| Emerald-MM 4-ch RS-232/422/485 Extended Temperature |
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Cables and accessories |
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| Cable, EMM-XT / EMM-DIO-XT, 2 DB9M to 1 IDC20, 18 inches (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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