16
The DTE connector uses a 25-position D-subminiature plug. The following table
provides the pin assignments for the EIA-530A and the V.35 connector to the RTU.
Signals that are not listed are not supported.
DB25 DTE Port Connector Pin Assignments
Signal Name
DB25
Plug
Signal Direction
MS34
Socket
Shield
1
—
Transmitted Data (TxD+)
2
To RTU (In)
P
Received Data (RxD+)
3
From RTU (Out)
R
Request to Send (RTS+)
4
To RTU (In)
C
Clear to Send (CTS+)
5
From RTU (Out)
D
DCE Ready (DSR)
6
From RTU (Out)
E
Signal Ground (SG)
7
—
B
Received Line Signal Detector (DCD+)
8
From RTU (Out)
F
Receiver Timing DTE (RxC–)
9
To RTU (In)
X
Received Line Signal Detector (DCD–)
10
From RTU (Out)
—
Transmit Timing DTE (TxCE+)
11
To RTU (In)
W
Transmitter Timing DCE (TxC–)
12
From RTU (Out)
AA
Clear to Send (CTS–)
13
From RTU (Out)
—
Transmitted Data (TxD–)
14
To RTU (In)
S
Transmitter Timing DCE (TxC+)
15
From RTU (Out)
Y
Received Data (RxD–)
16
From RTU (Out)
T
Receiver Timing DCE (RxC+)
17
From RTU (Out)
V
Local Loopback (LL)
18
To RTU (In)
N
Request to Send (RTS–)
19
From RTU (Out)
—
DTE Ready (DTR)
20
To RTU (In)
H
Transmit Timing DTE (TxCE+)
24
To RTU (In)
U
Test Mode (TM)
25
From RTU (Out)
NN
