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_ _ _ _ LEAR
SIEGLER, INC.
DATA PRODUCTS DIVISION
ADM 3A
EXTENSION
MODEM
J1
J2
1
1
ETXD
2
BREAK KEY
TRANSMIT DATA
2
TXD
TRANSMIT
SERIAL
DATA
GATED PORT
ERXD
3
RECEIVE DATA
3
RXD
103·202 LOCAL
4
RTS
ERTS
4
ECTS
5
CLEAR TO SEND
5
CTS
EDSR
6
Ct.-iA SET READY (NOT USED IN DISPLAY)
6
DSR
7
-¥
7
-
.
EOCD
a
8
DCD
EDTR
20
t - - - - t
EDTR
UDTR
>---.....,
20
DTR
ECLRXD·
17
20MA CURRENT
2~A
CURRENT
17
ClTXD-
8 I 01 RECTIONAl
ECLRXD·
24
LOOP RECEIVER
LOOP TRANSM ITTE R
24
CLTXD-
ECLTXD+
23
23
CLRXD~
20MA CURRENT
81 DIRECTIONAL
20MA CURRENT
ECl TXD·
25
LOOP RECEIVER
LOOP RECE IVER
Z5
CLRXD·
Figure 2·4. Modem and RS·232C Extension Interface Logic
2-6
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