Com2 Connector (Parcom2) - Xycom CHIP4e+ User Manual

COM2 Connector (PARCOM2)

This 25-pin DB connector sits on top of the parallel port. You can use it for three
separate devices, but you can connect only one at a time: the touch screen controller,
infrared (IR) interface, or RS-232 connector. The BIOS setup determines whether
COM2 is used for the RS-232 connector or the IR interface. Jumpers on the touch
screen controller select the COM2 or mouse ports. If a touch screen controller is
jumpered for COM2, COM2 is unavailable.
In the table below, the B following the pin number indicates COM2, the upper RS-
232 port.
Pin
1A
2A
3A
4A
5A
6A
7A
8A
9A
10A
11A
12A
13A
14A
15A
16A
17A
18A
19A
20A
21A
22A
23A
24A
25A
This connector also contains the remote system reset option. A normally open push
button switch can be connected to pins 11B and 7B. When the switch is pressed the
PB_RESET* signal is forced to GND, which causes the CPU to reset. You must set
jumper J1 to position B to enable this option.
Signal Pin Signal
STROBE 1B ORB_GND
PD(0) 2B TXD2
PD(1) 3B RXD2
PD(2) 4B RTS2
PD(3) 5B CTS2
PD(4) 6B DSR2
PD(5) 7B GND
PD(6) 8B DCD2
PD(7) 9B NC
PACK 10B NC
PBUSY 11B PB_RESET*
PE 12B NC
SELECT 13B NC
AUTOFEED 14B NC
PERROR 15B NC
INIT 16B NC
SELIN 17B NC
GND 18B NC
GND 19B NC
GND 20B DTR2
GND 21B NC
GND 22B RI2
GND 23B NC
GND 24B NC
GND 25B NC
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