The new Black APC Masterswitch, the one with the Ammeter, model number AP7920

Also AP9212 if that's a help.  Paul Sladen <apc@paul.sladen.org> 2004-02-26

This has a new RJ-12 [0] console port which nobody knew the pinout of.

NOTE, first diagrams are w.r.t Masterswitch as DCE.

   1 2 3 4 5 6
_________________
|  o o o o o o  |
|  | | | | | |  |   Console port Socket
|               |
'---._     _.---'
      |___|

     ___123456__
    /  //////  /|
   /          / |
  / ======== /  '
 /__________/  /
 |  Cable   | /
 |__________|/
    /    /
    '---'

1  GND ---+---
2  CD  -+-|---
3  TX  -|-|---  (Host -> Masterswitch)
4  RX  -|-|---  (Host <- Masterswitch)
5  CD  -+ |
6  GND ---+

 _________________________/
|       ___________       |
| /\  ./__________./   /\ |
| \/  \ 5 4 3 2 1 /    \/ |
|_____ \_9_8_7_6_/ _______|/

(Pin-out buzzed from supplied RJ-12 -> DE-9f serial cable).

RJ-12               DE-9

6  GND ------+--- GND  5    Green
5  CD  ---+  |         4    Yellow
4  RX  ---|--|---  RX  3    Orange
3  TX  ---|--|---  TX  2    Red
2  CD  ---+--|---  CD  1    Purple
1  GND ------+              Black

Switched around with the Masterswitch as a DTE (wired TERM), we have:

RJ-12            

6  GND ----------
5  DTR ---+        
4  TX  ---|--+
3  RX  ---|-----+
2  DTR ---+--   +        We can get by without the DTR signal:
1  GND ------+

Use this and Back-to-back RJ-45 Gender Bender to connection
to Cisco/Xyplex Terminal Server.

RJ-12                         RJ-45

1  GND ------------+            2 
2      ---+    +---|------ RX   3 
3  RX  ---|----+   +------ GND  4
4  TX  ---|--+   +-------- GND  5
5      ---+  +---|-------- TX   6
6  GND ---|-------+  +---- DTR  7  .... optional?
          +----------+          8

Use this long cable to connection to Cyclades Terminal Server.

RJ-12                         RJ-45

1  GND ------------+  +--- DTR  2  .... optional? 
2      ---+  +-----|--|--- RX   3 
3  RX  ---|--|-+   +--|--- GND  4
4  TX  ---|--+ | +----|--- GND  5
5      ---+    +-|----|--- TX   6
6  GND ---|------+    |         7
          +-----------+         8

Patched to an RJ-45:

8      5		    CTS		Clear To Send		Blue	1
1      8		    DCD		Data Carrier Detect	Orange	2
2      3		    RD		Received Data		Black	3
5      7		    SG		Signal Ground		Red	4
5      7		    SG		Signal Ground		Green	5
3      2		    TD		Transmitted Data	Yellow	6
4      20		    DTR		Data Terminal Ready	Brown	7
7      4		    RTS		Request To Send		White	8
6      6		    DSR		Data Set Ready		-	-
9      22		    RI		Ring Indicator		-	-

[0] some people searching confuse this with an RJ-11, which only has
four pins.  Also written RJ11 or RJ45 with no space.

[1] People also confused a DE-9 with a DB-9, which can be written
DE9 or DB9 (in female or male varieties).