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EMERALD-MM-8
8-Port RS-232/RS-422/RS-485 PC/104 Module

• 8 serial ports
• 8 digital I/O lines
• Jumper selectable RS-232, RS-422, RS-485 on all ports
• Up to 460.8kbps data rate
•16C654 Quad UARTs with 64-byte FIFOs
• Interrupt sharing - any no. of ports or boards

DESCRIPTION

SPECIFICATIONS

Now with higher density than ever, our new EmeraldMM-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: 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.

Number of ports
Protocols
Supported
Max Baud Rate
Communications
Base UART
FIFO
Protocol Config
Address / Interrupt
Configuration
Digital I/O
Short protection
Bus Interface
Power Draw
(typical)
Operating temp
Weight

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.

www.diamondsystems.com

8
RS-232, RS-422, RS-485
460.8Kbps
5,6,7 or 8 data bits; Even,
odd or no parity
16C654
64 bytes
Jumper
Jumper
8 individually prog.
Continuous, all outputs
PC/104 (ISA)
+5VDC±10%
-40°C to +85°C
2.6oz / 74g