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 Description
Emerald-MM-8P offers 8 multi-protocol serial ports on a single PC/104 module with complete software configurability via the operating system. Each port can be individually selected for RS-232, RS-422, or RS-485 under software control. Both local-echo and non-local-echo modes are supported for RS-485. I/O addresses and interrupt levels are also programmable, with interrupt sharing available for any number of ports. Each port may further be enabled or disabled in software. All configuration data is stored in an on-board EEPROM that is loaded automatically on power-up.
For applications where fixed addresses are desired, four groups of preset addresses are available with jumper settings that override the programmed settings. Line termination for RS-422/485 modes is also jumper-selectable.
Emerald-MM-8P offers 8 convenient digital I/O lines. The direction of each line is independently programmable. Diamond’s Universal Driver software provides software support for these digital I/O lines.
Two I/O headers are provided, with four serial ports and four digital I/O lines on each header. The board operates on +5V only, eliminating the need for a +12V supply that is often required for serial port operation.
Emerald-MM-8P is based on the 16C654 quad serial port IC. This device contains 4 identical sets of registers, one for each port, and is compatible with the standard PC serial port. Each port contains 64-byte transmit and receive FIFOs to support the high-speed 460.8kbps data rates. Model EMM-8P-XT is backward compatible with Diamond Systems’ EMM-8M-XT and EMM-8232-XT boards.
Features
- 8 serial ports with up to 460.8kbps data rates
- 16C654 UARTS with 64-byte FIFOs
- Software-configurable RS-232/RS-422/RS-485 protocols
- Software selectable I/O addresses and interrupt levels
- Supports interrupt sharing
- EEPROM storage of configuration data for automatic power-on configuration
- 8 programmable digital I/O lines
- Dual 40-pin I/O headers, 4 ports per header
- +5V only operation
- -40°C to +85°C operation
- PC/104 form factor
Block Diagram
Operating Systems Compatibility
The Emerald-MM-8P is compatible with DOS, Linux, QNX and Windows 98/NT/2000/XP/CE.
Specifications
| Serial Ports |
| Number of serial ports |
8 |
| Protocols |
RS-232, RS-422, RS-485 (local and no echo) |
| Configuration |
All features software configurable |
| Maximum baud rate |
460.8kbps |
| Communications parameters |
5, 6, 7, or 8 data bits; Even, odd, or no parity |
| Short circuit protection |
Continuous, all outputs |
| RS-232 mode |
| Input Impedance |
3KΩ min |
| Input voltage swing |
±30V maximum |
| Output voltage swing |
±5V min, ±7V typical |
| RS-422/RS-485 modes: |
| Differential input threshold |
-0.2V min, +0.2V max |
| Input impedance |
12KΩ minimum |
| Input current |
+1.0mA max (Vin = 12V)
-0.8mA max (Vin = -7V) |
| Differential output voltage |
2.0V min (RL=50Ω) |
High/low states differentia
output voltage symmetry |
0.2V max |
| Digital I/O |
| Number of I/O lines |
8 in, 8 out |
| Input voltage |
Low: -0.3V min, 0.8V max
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| Output voltage |
Low: 0.0V min, 0.4V max (IOL = 6mA max)
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| General |
| I/O header |
2 40-position (2×10) .025″ square pin header on .1″ centers;
Headers mate with standard ribbon cable (IDC) connectors |
| Dimensions |
3.55″ x 3.775″ |
| Power supply |
+5VDC ±10% |
| Current consumption |
160mA typical, all outputs unloaded |
| Operating temperature |
-40°C to +85°C standard, all versions |
| MTBF |
EMM-8P-XT: 490,502 hours |
| RoHS |
Compliant |
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PC/104 16-Bit Analog I/O Module with Autocalibration
