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Technical Document Reader
Document
098-100
Name

DC1000 User Manual

Description
The DC1000 user manual.
DC1000 User Manual
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Expand 1 Introduction1 Introduction
Expand 2 Getting Started2 Getting Started
Expand 3 Using the DC10003 Using the DC1000
4 RS232 Communication
5 Calibration
Expand 6 PC Software6 PC Software
7 Specifications

4.0 RS232 connection

Many PCs today do not come with an RS232 as standard. To add an RS232 port to your PC, Voltech recommend the use of one of the following USB to RS232 converters:

1. USB Gear (www.usbgrear.com) part number USBG-RS232-F12.
2. Cables to Go (www.cablestogo.com) part number 26886.

Both of these cables have been verified with the DC1000 software.

Pinning

The pinning of the 2 RS232 ports is as follows:

RS232 IN
TX = PIN 3
RX = PIN 2
CTS = PIN 8
RTS = PIN 7
0V = PIN 5

RS232 OUT
TX = PIN 2
RX = PIN 3
CTS = PIN 7
RTS = PIN 8
0V = PIN 5

������RS232 IN (Female) ����������������������RS232 OUT (Male)

Commands

For your convenience, listed below are the RS232 commands you can use to control the DC1000 remotely. The baud rate that you should use to communicate with the DC1000 is 9600, with 8 data bits, parity is none, 1 stop bit, and there is hardware flow control.

Please note that depending on the software that you are using to send these commands to the DC1000, the manner in which carriage returns and line feeds are sent differs. In the below commands <cr> and <lf> are used to indicate the need for a carriage return, or a line feed respectively. A line feed can be sent via a terminal emulator by pressing <ctrl> and j simultaneously.

TURN THE OUTPUT ON OR OFF

Command

“D_POWER,x <lf>”

This command will act in the same way as pressing the on/off switch on the front panel to turn the unit off.

If x = 0, then the power is turned off.
If x = 1, then the power is turned on.

Messages returned

The following messages will be returned:

Within 100ms, an attached unit will respond with:

“D_COUNT,xx <cr> <lf>”

where xx is the number of units in the chain.

Within 2 seconds, the unit will respond with:

“D_STAT,0,result <cr> <lf>”” where result is a single integer indicating the status of the unit and any other unit attached.

If everything is OK, 0 or 1 will be returned. If not, then a status number will be returned.

SET DC1000 OUTPUT CURRENT

Command

“D_SET,level <lf>”, where level is the demand in milli-Amps and can range from 100 to 25000. If multiple units are connected together, then the same current will be sent to each unit.

Messages returned

The following messages will be returned:

Within 100ms, an attached unit will respond with:

“D_COUNT,xx <cr> <lf>”

where xx is the number of units in the chain.

Within 2 seconds, the unit will respond with:

“D_STAT,0,status <cr> <lf>” where status is a single integer indicating the status of the unit and any other unit attached.

If everything is OK, 0 or 1 will be returned. If not, then a status number will be returned.

GET THE STATUS OF THE UNIT

Command

“D_STAT? <lf>”

This command will return the status of the attached DC Bias unit

Messages returned

The following messages will be returned:

The unit will respond with:

“D_STAT,0,status <cr> <lf>” where status is a single integer indicating the status of the unit and any other unit attached.

If everything is OK, 0 or 1 will be returned. If not, then a status number will be returned.

READ THE SERIAL NUMBER

Command

“D_SER? <lf> ”

Messages returned

The following will be returned

Serialnumber <cr> <lf> where serialnumber is the serial number of the DC1000 (Serial number returned will always be 12 digits, if the queried unit's serial number has less characters, then spaces will fill it out to 12.

GET THE NUMBER OF UNITS ATTACHED

Command

“D_COUNT? <lf>”

Messages returned

The following will be returned within 5 seconds

“D_COUNT,xx <cr> <lf>” where xx is the number of DC1000s in the chain.

STATUS NUMBERS

The DC1000 will return status numbers, either on the front panel display if there is an error, or via RS232 if it is requested. If the status is an error that is indicated in fig. 14 as needing to turn off the output, then in order to clear the error, and try again, the output must first be turned off. If multiple errors occur, either on the same unit, or on other units in the chain, then a combination of the status numbers will be returned.

Status Meaning Turn Off Output
0 Off -
1 On and all OK -
2 Compliance circuit error -
4 Trim error Yes
8 Safety interlock error Yes
16 Temperature error Yes
32 Ramp Up Yes
64 Ramp Down Yes
128 Current ADC Over range Yes
256 Compliance circuit error open circuit Yes
Fig. 14
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