Siemens SIMATIC TIWAY 1 Manual de usuario Pagina 21

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Network Design Considerations
2-4
TIWAY 1 TI505 NIM User Manual
2.2 RS-232-C
CABLE INST
ALLATION
The
physical layer in TIW
AY
I provides a modem interface for synchronous or asynchro
-
nous
modems at data transmission rates up to 1
15.2K bits per second.
2.2.1
RS-232-C Connections
The
modem interface provides standard signals, as defined in T
able 2T
able 3 for control
of
two-way alternate data transmission using both half
and full duplex modems.The mo
-
dem
interface is a standard “T
ype E” DTE configuration as defined in Section 5 of EIA
RS-232-C.
This interface uses a male (plug) 25-pin D-type connector on the communica
-
tion cable. The circuits and pin assignments for the RS-232-C connector are shown in
T
able 3.
T
able 3 RS-232-C Connections
Pin ISO# RS-232-C Name – Function
1 101 AA
– Protective Ground (chassis)
2 103 BA – T
ransmitted Data
3 104 BB
– Received Data
4 105 CA
– Request to Send (R
TS)
5 106 CB
– Clear to Send (CTS)
6 107 CC
– Data Set Ready (DSR)
7 102 AB
– Signal Ground
8 109 CF
– Received Line Signal Detector/
Data Carrier Detect (RLSD/DCD)
15 114 DB – T
ransmitter Signal Element T
iming
17 115 DD
– Receiver Signal Element T
iming
20 108/2 CD
– Data Terminal Ready (DTR)
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