User manual

ManualsBrandsWACHENDORFF ManualsPanel-Mount InstrumentsTimer/cyclemeter 0 - 10 Hz

Command String Construction

The command string must be constructed in a specific sequence. The meter

does not respond with an error message to illegal commands. The following

procedure details construction of a command string:

1. The first 2 or 3 characters consist of the Node Address Specifier (N) followed

by a 1 or 2 character node address number. The node address number of the

meter is programmable. If the node address is 0, this command and the node

address itself may be omitted. This is the only command that may be used in

conjunction with other commands.

2. After the optional address specifier, the next character is the command

character.

3. The next character is the register ID. This identifies the register that the

command affects. The P command does not require a register ID character. It

prints all the active selections chosen in the Print Options menu parameter.

4. If constructing a value change command (writing data), the numeric data is

sent next.

5. All command strings must be terminated with the string termination

characters * or $. The meter does not begin processing the command string

until this character is received. See timing diagram figure for differences in

meter response time when using the * and $ terminating characters.

Command String Examples:

1. Node address = 17, Write 350 to the Setpoint On value

String: N17VF350$

2. Node address = 5, Read Timer value, response time of 50 msec min

String: N5TA*

3. Node address = 0, Reset Setpoint output

String: RF*

4. Node address = 31, Request a Block Print Output, response time of 2 msec min

String: N31P$

Transmitting Data to the Meter

Numeric data sent to the meter must be limited to Transmit Details listed in the

decimal point and conforms the number to the appropriate display format. (For

example: The Timer range is set for tenths of a second and 25 is written to the

Timer Start register. The value of the register is now 2.5 seconds. In this case,

write a value of 250 to equal 25.0 seconds).

Note: Since the meter does not issue a reply to value change commands, follow

with a transmit value command for readback verification.

Sending Serial Commands and Data

When sending commands to the meter, a string containing at least one

command character must be constructed. A command string consists of a

command character, a value identifier, numerical data (if writing data to the

meter) followed by a command terminator character, * or $.

Command Chart

Value

Description

MNEMONIC Transmit Details (T and V)

A Timer TMR 6 digit, per Timer Range

B Cycle Counter CNT 5 digit

Timer Stop

Timer Start

TSP

TST

6 digit, per Timer Range

E Counter Start CST 5 digit

Setpoint ON

(Reset Output)

SPT

per Setpoint Assignment,

same as Timer or Counter

Setpoint

Time-out

Setpoint OFF

STO

SOF

6 digit, mm.ss.ss format

per Setpoint Assignment,

same as Timer or Counter

T, V, R

T, V

T, V, R

T, V

Receiving Data From The Meter

Data is transmitted from the meter in response to either a transmit command

(T), a block print request command (P) or a User Input print request. The

response from the meter is either a full field transmission or an abbreviated

transmission, depending on the selection chosen in Module 5.

Full Field Transmission

* These characters only appear in the last line of a block print.

The first two characters transmitted are the meter address. If the address

assigned is 0, two spaces are substituted. A space follows the meter address field.

The next three characters are the register mnemonic, as shown in the Register

Identification Chart.

The numeric data is transmitted next. The numeric field (bytes 7 to 18) is 12

characters long. When a display overflow exists for a requested timer or cycle

counter value, an * (used as an overflow character) replaces a space in byte 7.

Byte 8 is always a space.

The remaining ten positions of this field consist of seven positions for the

requested value with decimal points positioned for the selected timer range. The

data within bytes 9 to 18 is right-aligned with leading spaces for any unfilled

positions.

The end of the response string is terminated with a <CR> and <LF>. After the

last line of a block print, an extra <SP>, <CR> and <LF> are added to provide

separation between the print blocks.

Abbreviated Transmission

* These characters only appear in the last line of a block print.

The abbreviated response suppresses the node address and register mnemonic,

leaving only the numeric part of the response.

Meter Response Examples:

1. Node address = 17, full field response, Cycle Counter = 875

17 CNT 875 <CR><LF>

2. Node address = 0, full field response, Setpoint On value = 250.5

SPT 250.5<CR><LF>

3. Node address = 0, abbreviated response, Setpoint On value= 250, last line of

block print

250<CR><LF><SP><CR><LF>

Byte Description

1, 2 2 byte Node Address field [00-99]

3 <SP> (Space)

4-6 3 byte Register Mnemonic field

7-18

19 <CR> (carriage return)

20 <LF> (line feed)

21 <SP>* (Space)

22 <CR>* (carriage return)

23 <LF>* (line feed)

Byte Description

1-12

12 byte data field, 9 bytes for number and three bytes for

decimal points

13 <CR> (carriage return)

14 <LF> (line feed)

15 <SP>* (Space)

16 <CR>* (carriage return)

17 <LF>* (line feed)

12 byte data field; 9 bytes for number and three bytes for decimal

points

Applicable

Commands

Initiates a block print output. Registers in the

print block are selected in Print Options.

Block Print Request

(read)

Reset a value or the output. Must be followed

by a register ID character

ResetR

Write to register of the meter. Must be

followed by a register ID character and

numeric data.

Value Change (write)V

Read a register from the meter. Must be

followed by a register ID character.

Transmit Value (read)T

Address a specific meter. Must be followed

by one or two digit node address. Not

required when node address = 0.

Node (meter)

Address Specifier

NotesDescriptionCommand