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2.2.1.
DB9 Connector Signals
The DB9 connector signal assignments are compliant with the RS-232 serial interface
standard. Table 2-1 identifies the DB9 signal assignments.
Table 2-1: DB9 Connector
RS-232
Signal Name
DB9 Pin#
Signal Direction
Notes
Received Line Signal Detect
1
N/A
tied to pins 4 & 6
Received Data
2
PC
→
CLM-601
Transmitted Data
3
CLM-601
→
PC
Data Terminal Ready
4
N/A
tied to pins 1 & 6
Signal Ground (common)
5
N/A
tied to digital ground
DCE Ready
6
N/A
tied to pins 1 & 4
Request To Send
7
N/A
tied to pin 8
Clear To Send
8
N/A
tied to pin 7
Ring Indicator
9
N/A
no connection
“PC” = Control PC, workstation, or terminal
