Appendix B
Specifications
108
RS-232 Interface
The ASCII Unit is connected to peripheral devices through two RS-232C interfaces. To connect peripheral devices
to the ASCII Unit, use the included connectors.
The following figure shows the RS-232C connectors on the ASCII Unit. The electrical characteristics of these con-
nectors conform to the EIA-RS-232C standards. Signal directions are oriented from the point of view of the ASCII
Unit.
Pin
No.
Symbol
Name
Direction
1
FG
Frame ground
2
SD
Send data
Output
3
RD
Receive data
Input
4
RTS
Request to send
Output
5
CTS
Clear to send
Input
6
Not used
7
SG
Data send ready
8 to 19
---
Data terminal ready
Output
20
DTR
Signal ground
21 to 25
DSR
---
Not used
Input
1
14
13
25
1
14
13
25
Содержание C500-ASC04
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