Tonghui TH2512, TH2512A Operation Manual

TH2512 RS232

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TH2512 RS-485 operation manual

The instrument adopts 9600 baud rate without odd-even check， 10-bit asynchronous
communication mode of 1 start bit（0），8 data bit and 1 stop bit（1）.

Bus installing instruction：（TO SETUP RS-232 BUS）

A. Turn off TH2512/2512A power，and insert one terminal of RS-485 interface into

RS-232 interface socket on the rear panel of instrument, and the other to the

RS-485 bus.

B. The function of RS-485 interface is available after the instrument being turned on.

Command setup:

The command is the key content of TH2512/TH2512A remote-control which can

control when and how to start testing and send data to bus etc. The command is listed
as below：

RANGE COMMANDS:

R0:Range auto（start value）.
R1～R9: Range 1～9(TH2512:20mΩ bin～2MΩ bin，TH2512A:200Ω bin～200kΩ
bin ，so TH2512A doesn’t accept command R1 and R9 ).。
RF: Range hold.

SET COMMANDS:

S0: Slow （start value）.
S1: Fast
S2: Sorting ON.
S3: Sorting OFF （start value）.
S4: Resistance value （start value）.
S5: Percentage deviation value.
S6: Constant trigger（start value）.
S7: Single or external trigger.
S8: Correction ON。
S9: Correction OFF （start value）.
SP：RS232 Print ON

START COMMAND:

G: Start（trigger）

Require Data Command:

？：Query sending the test result.

Limit setup command

Nnnnnn：nominal value，such as：N01900，it means nominal value is 1.900m when the
range is 20m
Lnnn：Low limit value，such as:L090，it means low limit value is -9.0%

Hnnn：High limit value，such as L090，it means high limit value is +9.0%

Table A：Related commands

Note：These command characters can only be expressed by capital letter.

TH2512 RS232

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Explanation of command

1. RN

Range command copies all t\ranges of TH2512/TH2512A.

R0 command makes the range auto, and RF command makes range hold.
The range of TH2512/TH2512A can be selected by R1～R9 command，meanwhile use

range hold.

After the instrument being turned on, TH2512/TH2512A restores to default value：R0.

2. SN

The command copies all test conditions on the front panel，as the table above：
After the instrument being turned on, TH2512/TH2512A restores to default value S0、

S3、 S4、 S6、 S9。

3.G

A letter command, inputting the command is the same as pressing single.

4.?

A letter command，after inputting the command, the instrument can send the test result

to PC.

Caution ：SP command sets the print function of RS232 as on，by doing so, user can

read the test result without sending ？command constantly.

Use 485 bus to control instrument：

User can control the instrument by sending the command to TH2512/TH2512A，the
command can be single or in group, the format is ：

The first byte is scale-of-sixteen 55H + the second byte is address code + command +

the last byte is scale-of-sixteen 0AH.

Example：if the site of instrument id 6，and the instrument needs conteolling

to range 200mΩ，fast test，send the scale-of sixteen data :

55H，06H, 52H, 32H, 53H, 31H, 0AH

Output data: (data format)：

The message format is ：
Format： AAH + address + “H=±dddddd uu” + 0AH
Where： H: Displays type indication.

If being ：P: means displaying %.
If being：R: means displaying R.

dddddd : Test data, as table below：
uu : unit.

RANGE TEST DATA OUTPUT RESISTANCE VALUE IN OVER TANGE

R1 R1=**.***mO R1=999999mO
R2 R2=***.**mO R2=999999mO
R3 R3=*.****O R3=999999O
R4 R4=**.***O R4=999999O
R5 R5=***.**O R5=999999O
R6 R6=*.****kO R6=999999kO
R7 R7=**.***kO R7=999999kO
R8 R8=***.**kO R8=999999kO
R9 R9=*.****MO R9=999999MO