Network Design Considerations
2-4
TIWAY 1 TI505 NIM User Manual
2.2
RS-232-C CABLE INSTALLATION
The physical layer in TIWAY I provides a modem interface for synchronous or asynchro-
nous modems at data transmission rates up to 115.2K bits per second.
2.2.1
RS-232-C Connections
The modem interface provides standard signals, as defined in Table 2Table 3 for control
of two-way alternate data transmission using both half and full duplex modems.The mo-
dem interface is a standard “Type 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
Table 3.
Table 3 RS-232-C Connections
Pin
ISO#
RS-232-C Name – Function
1
101
AA – Protective Ground (chassis)
2
103
BA – Transmitted Data
3
104
BB – Received Data
4
105
CA – Request to Send (RTS)
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 – Transmitter Signal Element Timing
17
115
DD – Receiver Signal Element Timing
20
108/2
CD – Data Terminal Ready (DTR)
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