These RS232 data cables have been used during development. Their pinouts are provided here in the hope they will be useful.

Number 1) and 4) seem to be the best, for they have proper grounding of GND and Protective GND. Usual length of each cable is about 100cm.

Note

DTE = Data Terminal Equipment (Host)

This side is using a DB9 plug.
DCE = Data Communication Equipment (Chipflasher Board)

This side is using a Header10_2 Connector.

All pin names reflect their function from the host’s point of view (DTE pin labels). See cables.sch or cables.sch.png for more details.

Pin Functions and Zerocat Connect Usage

DTE Function	DTE pin label	DTE pin	DCE pin	Zerocat Connect Usage (Host)
Carrier Detect	CD	1	1	not used
Data Set Ready	DSR	6	2	not used
Receive Data	RXD	2	3	receive data
Request To Send	RTS	7	4	alternative reset line
Transmit Data	TXD	3	5	transmit data
Clear To Send	CTS	8	6	not used
Data Terminal Ready	DTR	4	7	default reset line
Ring Indicator	RI	9	8	not used
Ground	GND	5	9	gnd, power return

1) Black Cable

DTE pin label	DTE pin	colour	DCE pin
CD	1	brown	1
DSR	6	grey	2
RXD	2	blue	3
RTS	7	green	4
TXD	3	red	5
CTS	8	yellow	6
DTR	4	violet	7
RI	9	orange	8
GND	5	black	9
(GND and PGND) one one side	–	shield	–

DTE pin label	DTE pin	colour	DCE pin
RXD	2	brown	3
RTS	7	white	4
TXD	3	orange	5
DTR	4	green	7
GND	5	blue	9

DTE pin label	DTE pin	colour	DCE pin
DSR	6	white	2
RXD	2	black	3
RTS	7	yellow	4
TXD	3	brown	5
DTR	4	red	7
GND	5	orange	9

DTE pin label	DTE pin	colour	DCE pin
RXD	2	white	3
TXD	3	red	5
DTR	4	green	7
GND	5	yellow	9
(GND and PGND) on one side	–	blank	–

Copyright: Copyright (C) 2017, 2018 Kai Mertens kmx@p.nosp@m.oste.nosp@m.o.net
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled: GNU Free Documentation License