Specifications

158004.B00 E5
E.3 TP400 PERIPHERAL CONNECTOR
Many peripheral devices are connected to the TP400 through a 50 way IDC
connector, called J4. The 50 pins on the connector are brought to the outside world
through a 50-way 0.1 inch IDC right angled connector.
The J4 connector pin assignments are almost identical on all DSP Design PC/104
processor boards. The TP400 pin assignments are identical to the TB486, TC586
and TX486 pin assignments. However there are two minor differences between the
TP400 and the TC386/TC486 boards, which users who are updating from TC386 or
TC486 boards should note:
1 Pins 1 and 2 are IrDA pins on the TP400 and power supply pins on the
TC386/TC486.
2 When using COM2 in RS485 mode the RS485 A and B pins (pins 37 and 38)
are transposed between theTP400 and the TC386/TC486.
Table E7 lists the J4 signal name and also the peripheral to which the signal belongs
and the pin number of that peripheral’s connector. The standard connectors used in
PC’s for each of the peripherals are:
Centronics Printer: 25 way female D-type
Keyboard: 5 way female circular DIN
Mouse: 6 pin mini DIN (PS/2 style)
Serial COM1: 9 way male D-type
Serial COM2: 9 way male D-type
Loudspeaker: N/A
Battery: N/A
Reset Switch: N/A
Pin 1 of the J4 connector can be identified by looking at the J4 silk-screen box that
surrounds the J4 connector on the TP400. A “2” is located close to the pin 1 end of J4
and a “50” is placed close to the pin 50 end. All odd numbered pins are in one row
and all even numbered pins are in the other row.
Table E6 shows how J4 pins change function when COM2 is used for RS-485
operation.
RS-485 SIGNAL RS-232 SIGNAL J4 PIN
Transmit, inverting DTR2 35
Transmit, non-inverting CTS2 36
Receive, inverting TXD2 37
Receive, non-inverting RTS2 38
TABLE E6 - RS485 FUNCTION OF COM2 SERIAL PORT