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104
8. RS-232 Interface
8.1 Overview
The DSM-8104 features an RS-232 interface option as a communication function.
Basically, the data format and program messages of the RS-232 interface are the same
as those of the GP-IB interface, except some messages and other parts that are required
due to differences in the hardware. This chapter describes only the differences with the
GP-IB interface. For the other parts, the reader is requested to refer to Chapter 7
“GP-IB Interface.”
8.2
Connector Used and Signal Names
The connector for the RS-232 interface is a 9-pin D-sub female connector.
Table 8.1 Pin Nos. and Signal Names
Pin No.
Signal
Name
Function Remarks
1
D C D
Reception carrier detection
Not used with
DSM-8104
2
R X D
Reception
data
3
T X D
Transmission
data
4
D T R
Data
terminal
ready
5
G N D
Signal
ground
6
D S R
Data setting ready
Not used with
DSM-8104
7
R T S
Transmission
request
8
C T S
Transmission
authorized
9
R I
Incoming call indication
Not used with
DSM-8104
8.3 Changeover
to
GP-IB
GP-IB and RS-232 cannot be used simultaneously. The GP-IB or RS-232 interface
whichever accepts a message first is selected as an interface.
When changing the interface, temporarily reset to the local mode or turn the power
supply on again.
8.4 Connecting
Control
Signals and Flow Control
The flow of data transmission and reception is controlled in the DSM-8104 by controlling
the RTS signal. Control the controller in the Terminal mode by connecting as follows.
Содержание DSM-8104
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