Things Embedded are an official Diamond Systems UK distributor and can supply the EMERALD-MM-8PLUS.
The Emerald-MM-8Plus from Diamond Systems is a high performance multi-protocol serial communications board offering eight ports on a single PC/104-Plus module. Supporting baud rates up to 921.6K bps in RS-232 mode or 1.8432Mbps in RS422 or RS485 mode, each port can be individually selected for RS-232, RS-422, RS-485 or TTL level operation. Both local-echo and non-local-echo modes are supported for RS-485. Protocol selection is achieved via a jumper block for each of the eight ports. Line termination for RS-422/485 modes is also jumper-selectable.
Configuration of the Emerald-MM-8Plus is simple, using the built-in plug and play technology. For manual configuration, the base address for the board may be set in software, defining a 4K block of configuration space used to access the on-board registers. A single 32-bit read shows the detailed interrupt status for each of the eight ports. The PCI “slot” is defined through a jumper block. As with all Diamond Systems products, jumpers are paralleled with locations for zero ohm resistors to create a rugged, shock-and- vibration-resistant implementation.
Diamond Systems’ Emerald-MM-8Plus is based on the Exar 17D158 octal UART IC. This device contains 8 4 identical sets of 16C55registers, 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 data rates.
Emerald-MM-8Plus also offers 8 convenient digital I/O lines. The direction of each line is independently programmable. Finally, Emerald-MM-8Plus also offers a 16-bit programmable counter / timer with a configurable clock source.
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.
| Overview | |
|---|---|
| Brand & Model | Diamond Systems EMM-8PLUS-XT |
| PC/104-Plus 8-Port RS232/422/485 Serial I/O Module | |
| Features | Compact Industrial Rugged |
| Serial Ports | |
| Number of serial ports | 8 |
| Protocols | RS-232, RS-422, RS-485 (local and no echo) |
| Protocol Configuration | Jumpers |
| Software Configuration | Plug and Play |
| Maximum baud rate | 1.8432Mbps |
| 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 | 0.2V max |
| output voltage symmetry | |
| Digital I/O | |
| Number of I/O lines | 8 individually programmable |
| Input voltage | Logic 0: -0.3V min, 0.8V max |
| Logic 1: 2.0V min, 5.3V max | |
| Output voltage | 0: 6mA max |
| 1: -4mA max | |
| General | |
| I/O header | 2 40-position (2×20) .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 |
| Weight | 3.1oz (87.9g) |
| RoHS | Compliant |
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