3
GFK-0519B
Graphics Display Coprocessor (GDC)
5
4
SHLD
TD
RD
DCD
CTS
DTR
GND
f
3PL
4PL
RS-232
PCM
PROGRAMMING S/W
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IC647 PROGRAMMER
GDC
25-PIN
CONNECTOR
a44464
GDC
AT
9-PIN
CONNECTOR
GDC
25-PIN
CONNECTOR
AT CABLE
(IC690CBL701)
(IC690CBL702)
IC647 PROGRAMMER
PIN
PIN
PIN
PIN
3
2
5
20
8
1
7
2
3
8
9
7
TD
RD
RTS
CTS
DCD
DTR
GND
TD
RD
CTS
DTR
DCD
SHLD
GND
1
2
3
4
7
8
5
CD
RD
TD
DTR
RTS
CTS
GND
1
2
3
8
5
20
7
9-PIN
CONNECTOR
PROGRAMMER
Figure 3. Example of PCM Development System
Connection to GDC
Serial Ports
Although both ports are RS-232 and RS-422/RS-485
compatible and the signals shown in both Table 1 and
Table 2 are available at each connector, the use of each
port is dedicated for GDC operation.
Port 1 (3PL) and Port 2 (4PL)
Port 1 (3PL) is normally connected to an RS-232 serial
COM port of a host computer for communications to
PCOP at 19.2 Kilobaud. Alternately, port 1 may be
connected to a serial RS-232 printer (see the Graphics
Display System User’s Manual to reconfigure Port 1).
Figure 3 shows typical cable connections for this
purpose and Table 1 shows the details of the RS-232
signals.
Table 1. Port 1 and 2 - RS-232 Signals
PIN
FUNCTION
SIGNAL
NAME
I/O
1
Shield
-
-
2
Transmitted Data
TD
Output
3
Received Data
RD
Input
4
Request To Send
RTS
Output
5
Clear To Send
CTS
Input
7
Signal Ground
GND
-
8
Data Carrier Detect
DCD
Input
20
Data Terminal Ready
DTR
Output
Port 2 (4PL) is configured as a 1200 baud RS-422 port and
is dedicated to accepting keyboard input from the
GDT’s RS-422 port. Figure 4 shows appropriate cable
connections and Table 2 shows usable RS-422 signal
details.
Table 2. Port 1 and 2 - RS-422/485 Signals
PIN
FUNCTION
SIGNAL
NAME
I/O
7
Signal Ground
SG
-
9
Send Data (A)
SD (A)
Output
10
Request To Send (A)
RTS (A)
Output
11
Clear To Send (A)
CTS (A)
Input
12
Termination for pin 11
-
-
13
Receive Data (A)
RD (A)
Input
21
Send Data (B)
SD (B)
Output
22
Request To Send (B)
RTS (B)
Output
23
Clear To Send (B)
CTS (B)
Input
24
Termination for pin 25
-
-
25
Receive Data (B)
RD (B)
Input
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SD ( A )
SD ( B )
SIG GND
RD ( A )
RD ( B )
TERM
SIG GND
GDT
RS-422
PORT
25- PIN
MALE
25- PIN
FEMALE
25- PIN
MALE
PIN
a44456
PIN
13
25
24
7
4
3
9
25- PIN
FEMALE
GDC
PORT 2
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Figure 4. GDC Port 2 Connection to GDT
Video
The GDC provides EGA video resolution of 640 x 350
pixels. This video is provided to the GDT in the form of
RGB signals with sync on green. Video signals from the
GDC are provided through the 9-pin D connector on
the module. The cable has three RG-179/U coaxial
cables, terminated with three BNC connectors at the
GDT end. Figure 5 shows wiring details of this cable.
