PIPRS4

4-Port RS-232/RS-422/RS-485 PC/104 Module

The PIPRS4 module (Emerald-MM) gives you 4 serial ports operating at speeds up to 115kbps.

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.

The PIPRS4 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. 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.

Another distinguishing feature of PIPRS4 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.

Technical Features

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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