4.0 - APPENDIX
4.1 EIA INTERFACE CHART
EIA RS-232-D INTERFACE CHART (DB-25 CONNECTOR)
X
External Timing
DA
113
24
X
Terminal Ready
CD
108.2
20
X
Receive Timing
DD
115
17
X
Send Timing
DB
114
15
- Voltage(-9v)
10
+ V9v)
9
X
Receive Line Detector
CF
109
---
---
Signal Ground
AB
102
7
X
DCE Ready
CC
107
6
X
Clear To Send
CB
106
5
X
Request To Send
CA
105
4
X
Receive Data
BB
104
3
X
Send Data
BA
103
2
---
---
Shield
---
---
1
To DCE
To DTE
Signal Description
Circuit
Name
CCITT
Circuit No.
Pin No.
DMM-4DC OPERATIONS MANUAL
Page 8
