The Infrared Wireless Expert
ACT-IR8250P
Specification
7. Connect ACT-IR8250P to a Host Device with RS232 Port
Devices that use serial cables for their communication are split into two categories. These are DCE
(Data Communications Equipment) and DTE (Data Terminal Equipment.) Data Communications
Equipment is device such as your modem, TA adapter, plotter etc while Data Terminal Equipment is
your Computer or Terminal. The following shows how to connect IR8250P to a DTE and a DCE.
Note: A RS232 level converter chip is needed when IR8250P is connected to a RS232 interface.
There are a total of 7 signals between the host and the IR8250P. The pin assignment and name of
each signal at the chip levels are summarized in Table 1 below. Please note that DTE denotes
signals on the RS232 board or device. In order to connect them to another DTE, a null-modem
converter is used in-between. The pin assignment and name are listed in this table.
Table : Host interface signals
ACT-IR8250P
RS232 DTE device
RS232 DCE device
Pin No. Type
Name
Pin No. Type
Name
Pin No. Type
Name
15 O TX 2 I RX 3 I RX
16 I RX 3 O TX 2
O TX
8 I nEnable 4 O DTR 6 O DSR
21 O Status 6 I DSR 4 I DTR
10 I
STOP_TX
7 O RTS 8
O CTS
22 O
STOP_RX
8 I CTS 7 I RTS
4 GND 5 GND 5
GND
© Copyright 2003-2005 ACTiSYS Corp. Page 12 of 25
Jan 28, 2005
Rev. 0.44
