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G8MNY > IBM 23.09.04 17:30l 150 Lines 7397 Bytes #999 (0) @ WW
BID : 12040_GB7CIP
Read: GUEST DC9BM
Subj: Serial Interface Connections
Path: DB0FHN<DB0RGB<DB0MRW<DB0ERF<DB0FBB<DB0FHK<DB0SIF<DB0EA<DB0RES<ON0AR<
ON0AR<F6KMO<F5GI<DK0WUE<HA3PG<IK1ZNW<GB7CRV<GB7CIP
Sent: 040923/1019Z @:GB7CIP.#32.GBR.EU #:12040 [Caterham] $:12040_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : IBM@WW
25 Way D-Type Serial:
1 - NC 7 - Signal Ground
2 - Transmit Data 8 - Carrier Detect 1 13
3 - Receive Data 9-19 - NC x x x x x x x x x x x x x
4 - Request To Send 20 - Data Terminal Ready x x x x x x x x x x x x
5 - Clear To Send 21 - NC 14 25
6 - Data Set Ready 22 - Ring Indicate
23-25 - NC
9 Pin D-Type Serial:
1 - Carrier Detect 6 - Data Set Ready 1 5
2 - Receive Data 7 - Request To Send x x x x x
3 - Transmit Data 8 - Clear To Send x x x x
4 - Data Terminal Ready 9 - Ring Indicate 6 9
5 - Signal Ground
RS-232C INTERFACE STANDARD (25Way)
DTE (eg computer) ! DCE (eg Modem)
Data Terminal Equipment ! Data Communications Equipment
Signal EIA / CCITT Pin Telephone Co. Signal
Direct Line Number No. Lead Number Direction
- Protective Ground 1 AA/101 -
- Signal Ground 7 AB/102 -
- Transmitted Data 2 BA/103 >
< Received Data 3 BB/104 -
- Request to Send 4 CA/105 >
< Clear to Send 5 CB/106 -
< Data Set Ready 6 CC/107 -
- Data Terminal Ready 20 CD/108.2 >
- Connect Data Set to line 20 * /108.1 >
< Received Line Signal Detector 8 CF/109 -
- Speed Select 23 CH/111 >
< Transmit Signal Element Timing 15 DB/114 -
< Receive Signal Element Timing 17 DD/115 -
- Select Standby 11 * /116 >
< Ring Indicator 22 DE/125 -
- Test 18 * /* >
* means non-defined/standardized by EIA / CCITT
Switched Timing Sequence (dial-up modem line communication)
____________________________________________
Data Terminal Ready ___!
_________________________________________
Data Set Ready ______!
_______________________
Request To Send _________! !______________
________________________
Clear To Send ____________! !__________
_________________
Transmitted Data _______________! !______________
Nonswitched Timing Sequence (direct line connection)
____________________________________________
Data Terminal Ready ___!
_________________________________________
Data Terminal Ready ______!
________________________
Request To Send _________! !______________
_________________________
Clear To Send ____________! !__________
______________
Transmitted Data _______________! !__________________
-------------------------------------------------------------------------
IBM PC-AT Serial cable DB25 to DB9
serial adapter on computer (cable connector is female)
Signal Direction
25 pin 9 pin Cable-Computer
DB25 DB9 DCE-ADAPTER
8 Carrier Detect 1 >
3 Received Data 2 >
2 Transmitted Data 3 <
20 Data Terminal Ready 4 <
7 Signal Ground 5 -
6 Data Set Ready 6 >
4 Request to send 7 <
5 Clear To Send 8 >
22 Ring Indicator 9 >
All other pins on the 25 pin connector are unused.
---------------------------------------------------------------------------
RS232 x connections. Comprehensive RS-232 computer to Tnc cross reference
Jumpers if needed, on a three wire RS232. AT the COMPUTER end only.
----------
DB-25: DE-9:
RTS CTS RTS CTS
4----5 7----8
6----8---20 1----4----6
DSR DCD DTR DCD DTR DSR
RS-232 Serial port "3 Wire" Cable wiring for DB-25 to DE-9 or DE-25.
Computer DB-25 TNC DE-9 TNC(type 2)DB-25s.
TO OR
1 and 7 ------------ 5 ---------------- 1
2 ------------------- 3 ---------------- 2
3 ------------------- 2 ---------------- 3
-------------------------------------------------------------------------
RS-232 Serial port "3 Wire" Cable wiring for DE-9 to DE-9 or DE-25.
Computer DE-9 TNC DE-9 TNC(type 2)DB-25s.
TO OR
5 and Shell --------- 5 ---------------- 1
2 ------------------- 2 ---------------- 3
3 ------------------- 3 ---------------- 2
----------------------------------------------------------------------
"Eight-Wire" RS-232 Cable (conventional)
Computer to TNC
DB-25 or DE-9 to DE-9p or DB-25S
1 shell ------------------ 5 1
2 3 ------------------ 3 2
3 2 ------------------ 2 3
4 7 ------------------ 7 n/c
5 8 ------------------ 8 5
6 6 ------------------ 6 6
7 5 ------------------ 5 7
8 1 = "connected sig" 1 8
20 4 ------------------ n/c 20
-----------------------------------------------------------------------
Serial Port Cross Reference.
Conventional IBM AT TNC-320 TNC_2
DB-25 p/s De-9P DE-9p DB-25s
pin Function
FGround 1 shell 5 1
Txd 2 3 3 2
RxD 3 2 2 3
RTS 4 7 7 n/c
CTS 5 8 8 5
DSR 6 6 6 6
Sig Earth 7 5 5 7
DCD 8 1 1 (a) 8 (a
test 9 V+ - +12 V
test 10 V- - -12 V
DTR 20 4 n/c 20
RI 22 9 9 (b) (23)
(a) This line goes high when a connection exists.
(b) RFDCD (Also used for multi_node NET/ROM and ROSE)
Why Don't U send an interesting bul?
/QSL
73 De John, G8MNY @ GB7CIP
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