RS-232 Modem Cable Pinout - Revision history

PoC: Source

2023-05-22T08:23:22Z

Source

← Older revision		Revision as of 10:23, 22 May 2023
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	This is the tested '''pinout''' for an '''RS-232 Modem Cable''', being capable of synchronous transfers. The pinout has been derived from an existing cable.		This is the tested '''pinout''' for an '''RS-232 Modem Cable''', being capable of synchronous transfers. The pinout has been derived from an existing cable, part number 22F0250 (CIN 9022).

	It is also referred to as the ''EIA-232/X.21bis Communications Adapter Cable''.		It is also referred to as the ''EIA-232/X.21bis Communications Adapter Cable''.

PoC: /* Weblinks */ Linkfix

2023-05-21T12:16:30Z

Weblinks: Linkfix

← Older revision		Revision as of 14:16, 21 May 2023
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	== Weblinks ==		== Weblinks ==
	* [https://en.wikipedia.org/wiki/RS-232 RS-232], Wikipedia		* [https://en.wikipedia.org/wiki/RS-232 RS-232], Wikipedia
	* [https://~~ibmdocs~~.~~pocnet~~.~~net~~/~~SY44-5902-03.pdf~~ AS/400 Service Functions], SY44-5902-03<ref>PDF page 249, Table 58, displays the pins according to IBM.</ref>		* [https://www.ibm.com/resources/publications/OutputPubsDetails?PubID=SY44590203 AS/400 Service Functions], SY44-5902-03<ref>PDF page 249, Table 58, displays the pins according to IBM.</ref>

	== Footnotes ==		== Footnotes ==

PoC: Which cable?

2022-02-14T12:23:22Z

Which cable?

← Older revision		Revision as of 14:23, 14 February 2022
Line 1:		Line 1:
	This is the tested '''pinout''' for an '''RS-232 Modem Cable''', being capable of synchronous transfers.		This is the tested '''pinout''' for an '''RS-232 Modem Cable''', being capable of synchronous transfers. The pinout has been derived from an existing cable.

			It is also referred to as the ''EIA-232/X.21bis Communications Adapter Cable''.

	== Pinout ==		== Pinout ==
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	== Weblinks ==		== Weblinks ==
	* [https://en.wikipedia.org/wiki/RS-232 RS-232], Wikipedia		* [https://en.wikipedia.org/wiki/RS-232 RS-232], Wikipedia
	* [https://ibmdocs.pocnet.net/SY44-5902-03.pdf AS/400 Service Functions], SY44-5902-03<ref>PDF page ~~245~~, Table 51, ~~bottom line on that page~~ displays the ~~cable-id connected~~ pins~~. See also the notes on the top of the next page~~.</ref>		* [https://ibmdocs.pocnet.net/SY44-5902-03.pdf AS/400 Service Functions], SY44-5902-03<ref>PDF page 249, Table 58, displays the pins according to IBM.</ref>

	== Footnotes ==		== Footnotes ==

PoC: New

2022-02-14T12:15:05Z

New

New page

This is the tested '''pinout''' for an '''RS-232 Modem Cable''', being capable of synchronous transfers.

== Pinout ==
Both ends utilize D-Sub 25 Pin connectors:
* Female for the "machine end" (DTE),
* male for the "modem end" (DCE).

These pins<ref>And only these, no more! I had very interesting issues with a Cisco Router when each and all pins were connected straight through.</ref> should be connected one-to-one:
{|class="wikitable"
!Pin
!Signal
|-
|2
|TxD
|-
|3
|RxD
|-
|4
|RTS
|-
|5
|CTS
|-
|6
|DSR
|-
|7
|Gnd
|-
|8
|DCD
|-
|15
|ST (Clk)
|-
|17
|RT (Clk)
|-
|20
|DTR
|-
|22
|RI
|-
|23
|Signal Rate Select
|-
|24
|TT (Clk)
|}

In addition, on the DTE end's female connector, the otherwise unused pins 1, and 13 must be connected to signal ground, Pin 7. Older AS/400's require this to sense if, and which type of cable is connected to the serial port.

You could easily just solder a short run of ribbon cable between two plugs, and use an existing "PC style" modem cable to gain length. It's nevertheless very important that all 13 wires are connected. Especially the clock signals are very important to support synchronous transmission.

== See also ==
* [[Serial Cables IDs]]
* [[Integrating LAN-less Machines into a local Token Ring]]

== Weblinks ==
* [https://en.wikipedia.org/wiki/RS-232 RS-232], Wikipedia
* [https://ibmdocs.pocnet.net/SY44-5902-03.pdf AS/400 Service Functions], SY44-5902-03<ref>PDF page 245, Table 51, bottom line on that page displays the cable-id connected pins. See also the notes on the top of the next page.</ref>

== Footnotes ==
<references />

[[Category: Hardware Documentation]]