PPM3 MKII Programmer - User Guide - V1.04 - 10
th
May 2008
55
3.8 RS-232 Serial Cable Pin-outs
Fig. 3.8.1 Pin-out RS-232 Communications Port
Pin No. RS232 pin
Description
1
DCD
Controls the RESET pin of the programmer ATmega128 controller
during the Firmware Update process. Jumper LK1 must be fitted to link
DCD to the RESET pin.
2 RXD
Receive
3 TXD
Transmit
4
DTR
Same function as DCD.
5 0
Volt
0V
6 DSR
Not
Connected
7
RTS
Used as Serial Clock signal during the Firmware Update process.
8
CTS
Connected to RXD
9 RING
Not
Connected
Fig. 3.8.2 Connections for 9-way to 9-way Serial Cable (Straight through cable)
9-way (Male)
9-way (Female)
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
Fig. 3.8.3 Connections for 9-way to 25-way Adaptor
25-way (Female) 9-way (Male)
8 1
3 2
2 3
20 4
7 5
6 6
4 7
5 8
22 9
Summary of Contents for PPM3 MK2
Page 1: ...User Guide...
