48
APPENDIX D
RS232 PIN OUTS
9 Pin Connections
When the serial port is configured to “No Flow Control,” only
Transmit
,
Receive
, and
Ground
connections are required. Pin 7 and Pin 8 need to be connected only if other serial
flow control types are selected.
Computer DB9/M Serial Port
Monitoring Unit DB9/F
Pin
1
(Carrier
Detect)
Pin
1
(No
Connection)
Pin
2
(Receive
)
Pin
2
(Transmit)
Pin
3
(Transmit)
Pin
3
(Receive)
Pin 4 (Data Term. Ready)
Pin 4 (No Connection)
Pin
5
(Ground)
Pin
5
(Ground)
Pin 6 (Data Set Ready)
Pin 6 (Control Line between Units)
Pin 7 (Request to Send)
Pin 7 (Internal
Pin 8 (Clear to Send)
Pin 8 Connection)
Pin
9
(Ring
Indicator)
Pin
9
(No
Connection)
25 Pin Connections
If connecting to a 25 pin serial port on the computer, we suggest using a 9 to 25 pin serial
adapter. The pin outs on a 25 pin serial port are not the same as a 9 pin port. When the serial
port is configured to “No Flow Control”, only
Transmit
,
Receive
, and
Ground
connections
are required.
Request to Send
and
Clear to Send
connections will need to be connected only
if other serial flow control types are selected.
Computer DB25/M Serial Port
Monitoring Unit DB9/F
Pin
2
(Transmit)
Pin
2
(Transmit)
Pin
3
(Receive
)
Pin
3
(Receive)
Pin 4 (Request to Send)
Pin 7 (Internal
Pin 5 (Clear to Send)
Pin 8 Connection)
Pin
7
(Ground)
Pin
5
(Ground)
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