Network Installation
2-12
TIWAY I Gateway User Manual
2.3 Network Media Installation — RS-232-C Modem Interface
The
physical layer in TIW
A
Y I provides a modem interface for synchronous
or asynchronous communications at data transmission rates up to 1
15.2 K
bps. The modem interface provides standard signals for control of two-way
alternate data transmission using both half and full duplex modems.
The modem interface is a standard T
ype E DTE configuration as defined in
the EIA RS-232-C standard. This interface uses a male 25-pin D-type
connector plug on the communication cable. The pin assignments are listed
in T
able 2-2.
T
able 2-2 RS-232-C Connector Pin Assignments
Pin No. Description
1 Protective Ground
2 Transmit Data
3 Receive Data
4 Request to Send (RTS)
5 Clear to Send (CTS)
6 Data Set Ready (DSR)
7 Signal Ground
8 Receive Line Signal Detector/Data Carrier Detect (RLSD/DCD)
15 Transmitter Signal Element Timing
17 Receiver Signal Element Timing
20 Data Terminal Ready (DTR)
Data
T
ransmission
Characteristics
RS-232 Pin
Assignments
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