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Graphics Display Coprocessor (GDC)
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PROGRAMMER
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IC647 PROGRAMMER
(IC690CBL701)
PIN
PIN
3
RD
TD
2
RD
3
2
TD
5
CTS
RTS
4
DTR
20
CTS
5
DCD
8
DCD
8
SHLD
1
DTR
9
7
GND
7
GND
IC647 PROGRAMMER
GDC
9-PIN
25-PIN
CONNECTOR
CONNECTOR
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
1
Shield
2
Transmitted Data
3
Received Data
4
Request To Send
5
Clear To Send
7
Signal Ground
8
Data Carrier Detect
20
Data Terminal Ready
a44464
GDC
RS-232
3PL
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4PL
PCM
PROGRAMMING S/W
AT CABLE
(IC690CBL702)
PIN
PIN
SHLD
1
1
CD
2
RD
2
TD
3
3
RD
TD
8
DCD
DTR
4
5
CTS
RTS
7
20
8
DTR
CTS
7
5
GND
GND
AT
GDC
9-PIN
25-PIN
CONNECTOR
CONNECTOR
SIGNAL
I/O
NAME
-
-
TD
Output
RD
Input
RTS
Output
CTS
Input
GND
-
DCD
Input
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
7
Signal Ground
9
Send Data (A)
10
Request To Send (A)
11
Clear To Send (A)
12
Termination for pin 11
13
Receive Data (A)
21
Send Data (B)
22
Request To Send (B)
23
Clear To Send (B)
24
Termination for pin 25
25
Receive Data (B)
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PIN
RD ( A )
13
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Î Î
RD ( B )
25
GDC
TERM
24
Î
PORT 2
SIG GND
7
Î
25- PIN
25- PIN
FEMALE
MALE
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.
3
GFK-0519B
SIGNAL
I/O
NAME
SG
-
SD (A)
Output
RTS (A)
Output
CTS (A)
Input
-
-
RD (A)
Input
SD (B)
Output
RTS (B)
Output
CTS (B)
Input
-
-
RD (B)
Input
PIN
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4
SD ( A )
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GDT
3
SD ( B )
RS-422
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PORT
9
SIG GND
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Î
25- PIN
25- PIN
MALE
FEMALE
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