STEP 4A -
RS-232 Pinout for SP385A-R3
1
6
7
1
2
6
2
3
4
5
3
4
5
7
8
9
8
9
TABLE 1. RS-232 AND TTL PINOUT (DB9 MALE DTE)
PIN
SIGNAL NAME
RS-232 SIGNALS
TTL SIGNALS
1
DCD (Data Carrier Detect)
Input
Not used
2
RD (Receive Data)
Input
Input
3
TD (Transmit Data)
Output
Output
4
DTR (DTE Ready)
Output
Not used
5
SG (Signal Ground)
Ground
Ground
6
DSR (DCE Ready)
Input
Not used
7
RTS (Request to Send)
Output
Output
8
CTS (Clear to Send)
Input
Input
9
RI (Ring Indicator)
Input
Not used
