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COM1 Serial Port
The COM1 Serial Port is located on the back panel of the VRC 6940.
descriptions.
Pin
1
2
3
4
5
6
7
8
9
10
11
12-19
20
21
22
23
24
25
1
RS-232 signal
2
Symbol internal test signals
Table D-3. COM1 Serial Port Descriptions
Name
GROUND
TRANSMIT DATA
RECEIVED DATA
REQUEST TO SEND
CLEAR TO SEND
DATA SET READY
SIGNAL GROUND
CARRIER DETECT
Not used
Not used
REV CH
Not used
DATA TERMINAL READY
Not used
RING INDICATOR
Not used
2
Reserved
2
Reserved
Environmental and Technical Specifications
Signal
GND
TXD
RXD
RTS
CTS
DSR
GND
DCD
DTR
RI
Table D-3
lists the pin
Direction
1
IN
1
OUT
1
IN
1
OUT
1
IN
1
IN
1
—
1
IN
1
OUT
1
OUT
1
IN
D-3
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