Chroma 6460 - Wire Connection of RS-232 C; The GPIB Capability of the AC Source

Programmable AC Source 6460/6463/6490 User’s Manual
5-2
5.1.2 Wire Connection of RS-232C
The AC source is shipped with the baud rate which is set at 9600, and with parity which is set
as None. For RS-232C interface, only the signals of TxD, RxD, DTR, and CTS are used for
its transfer of data. The RS-232C connector is a 9-pin D subminiature female connector.
The following table describes the pins and signals of RS-232C connector.
Pin No.
Input/Output
Description
1
---
No connection
2
OUTPUT
TxD
3
INPUT
RxD
4
INPUT
DSR
5
---
GND
6
OUTPUT
DTR
7
INPUT
CTS
8
OUTPUT
RTS
9
---
No connection
Interconnection between the computer (compatible with IBM PC) and the AC source is
illustrated below:
IBM PC AC source
1 (DCD) X
2 (Rx) < - - - - - 2 (Tx)
3 (Tx) - - - - - > 3 (Rx)
4 (DTR) - - - - - > 7 (CTS)
5 GND - - - - - - 5 GND
6 (DSR) X
7 (RTS) X
8 (CTS) < - - - - - 6 (DTR)
9 (RI) X
DTR of the AC source is inactive if receiver‘s buffer is full. It means that the AC source will
not receive any data until DTR is active. Similarly, if CTS of the AC source is inactive, data
will not be sent to the computer.
5.2 The GPIB Capability of the AC Source
GPIB Capability
Description
Interface Functions
Talker/Listener
Commands and response messages can be sent
and received over the GPIB bus. Status
information can be read using a series poll.
AH1, SH1, T6, L4
Service Request
The AC source sets the SRQ line true if there is an
enabled service request condition.
SR1
Remote/Local
The AC source powers up in local state. In local
state, the front panel is operative, and the AC
source responds to the commands from GPIB. In
remote state, all front panel keys except the local
key are disabled. Press local
key to return the AC
source to local state. Local key can be disabled
RL1