Chroma 61705 - Remote Operation; Remote Control Setup and Capabilities

Remote Operation
8-1
8. Remote Operation
8.1 General Information
The AC Source can be controlled remotely through the GPIB or the RS-232C port. The
GPIB port is mostly used, but the RS-232C port is helpful too.
Technically speaking, the GPIB interface is quite different from the RS-232C interface. The
GPIB interface is an 8-bit parallel data bus owning a host of bus commands for
synchronization, and up to one Megabyte transfer rate. The RS-232C interface, a series bus
with a few handshake lines for synchronization, is less capable, so its requirement is not so
much, and users can write a simple program to do basic remote control easily.
8.1.1 Setting the GPIB Address and RS-232C Parameters
The AC Source is shipped with the GPIB address which is set to 30. The address can be
changed from the “CONF” functional list menu (refer to 3.6.2) only. This menu is also used
to select the RS-232C interface, and specify the parameters of RS-232C such as baud rate
and parity.
8.1.2 Wire Connection of RS-232C
The AC Source is shipped with the baud rate which is set to 19200, and with parity which is
set to None. For RS-232C interface, only the signals of TxD and RxD are used for its
transferring 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
---
No connection
5
---
GND
6
---
No connection
7
---
No connection
8
---
No connection
9
---
No connection
Interconnection between the computer (compatible with IBM PC) and the AC Source is
illustrated below: