DESCRIPTION AND OPERATION
I-E96-217A
2 - 9
a DTE device is a computer or terminal. The SPM functions
with a DCE device through a type Z interchange.
The handshaking signals can be configured using jumpers on
the SPM. This allows the SPM to match the handshaking signal
requirements of the device connected to it.
A description of each SPM signal line follows. The RS-232C pin
names and functions are defined with respect to the DTE
device. For example, the RX DATA (RECEIVED DATA) line is
input or received by the DTE (e.g., computer) and output or
transmitted from a DCE (e.g., SPM). The pin numbers given
refer to the SPM and NTCU01 RS-232C connectors shown in
Figure
Pin 1
PROTECTIVE GROUND (PROT GND) - This is a protective
ground line electrically connected to the equipment frame.
Pin 2
TRANSMITTED DATA (TX DATA) - Serial data line that is a
serial data output from the DTE to a DCE.
For the SPM, this is the serial data input line.
Pin 3
RECEIVED DATA (RX DATA) - Serial data line that is a serial
data input to the DTE from a DCE.
For the SPM, this is the serial data output line.
Pin 4
REQUEST TO SEND (RTS) - DTE output signal line that it uses
to signal a DCE to begin transfer of data.
For the SPM, this signal is NOT used by SPM software. When
connecting Bailey Controls equipment, jumpers (JP3 and JP5)
tie this line active high to continuously enable the serial inter-
face circuits (i.e., ACIAs). This line can be enabled with the
Figure 2-2. Serial Port Connector Pin Numbers
IMSPM01 FACEPLATE AND NCTU01 CONNECTORS
CABLE CONNECTOR
TP27273A
1
13
13
1
25
14
11
3
23
16
10
4
22
17
9
5
21
18
8
6
20
19
12
2
24
15
7
7
19
20
6
8
18
21
5
9
17
22
4
10
16
23
3
11
15
24
2
12
14
25
