Table 3-1 - RS-232 Signals and Pin Assignments
Pin Signal Direction Description
1 GND — Protective Shield Ground
2 TXD → Transmit data
3 RXD ← Receive Data
4 RTS → Request to Send
5 CTS ← Clear to Send
6 DSR ← Data Set Ready
7 GND — System Ground
8 CD ← Carrier Detect
9 RESERVED
10 RESERVED
11 STF → Select Transmit Channel
12 S.CD ← Secondary Carrier Detect
13 S.CTS ← Secondary Clear to Send
14 S.TXD → Secondary Transmit Data
15 TCK ← Transmission Signal Element Timing
16 S. RXC ← Secondary Receive Data
17 RCK ← Receiver Signal Element Timing
18 LL → Local Loop Control
19 S.RTS → Secondary Request to Send
20 DTR → Data Terminal Ready
21 RL → Remote Loop Control
22 RI ← Ring Indicator
23 DSR → Data Signal Rate Selector
24 XCK → Transmit Signal Element Timing
25 TI ← Test Indicator
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