2103 Modem Module

Section 5 Modbus Protocol

Table 5-2 Modbus ASCII Address 2-(N+1) Register Definitions (Continued)

Register Number(s)

Name

Data Type

Units

Read/Write

 

 

 

 

 

(1)A write to the Identify module register will cause the module to perform the identify operation which may be a steady LED for a few seconds or a beep in the Field Wizard.

(2)Setting the Take Reading flag to 1 will cause the module to update the registers with current data readings. It will be set to zero when the readings have all been updated. This may be used to initiate readings and poll for when they are ready to be read. It may take up to 50 seconds to update all the readings, depending upon the flow con- ditions. Setting the Take Reading flag to 2 causes an automatic, 15 second update of readings when a Modbus master is polling the 2100.

(3)The Update Interval specifies an interval in seconds that the registers are automatically updated. It defaults to zero, which indicates that no automatic updating will occur.

(4)The Active Flag (1-4) bit fields specify what fields/registers are active in the list. This provides support for a maxi- mum of 64 fields. For example, if bit 0 of register 27 is set, the Level (registers 40,41) is active. If bit 1 of register 27 is set, then the Velocity (registers 55,56) is active. If bit 0 of register 28 is set, the Analog channel 7 (registers 265,266) is active.

(5)A non-zero status code indicates a measurement problem.

(6)Time is represented in a series of registers: Order is from lowest address to highest - Seconds (0-59), Minutes (0-59), Hours (0-23), Days (1-31), Month (1-12) and Year (1977-2099).

117

Volume 1 status code

16-bit integer

 

Read

 

 

 

 

 

118-123

Volume 1 time record

Time

 

Read

 

 

 

 

 

130,131

Voltage

4-byte float

Volts

Read

 

 

 

 

 

132

Voltage status code

16-bit integer

 

Read

 

 

 

 

 

133-138

Voltage time record

Time

 

Read

 

 

 

 

 

145,146

Temperature

4-byte float

Degrees Celsius

Read

 

 

 

 

 

147

Temperature status code

16-bit integer

 

Read

 

 

 

 

 

148-153

Temperature time record

Time

 

Read

 

 

 

 

 

160,161

Internal Temp

4-byte float

Degrees Celsius

Read

 

 

 

 

 

162

Internal Temp status code

16-bit integer

 

Read

 

 

 

 

 

163-168

Internal Temp time record

Time

 

Read

 

 

 

 

 

175,176

Analog channel 1

4-byte float

0-100 percent

Read

 

 

 

 

 

177

Analog channel 1 status code

16-bit integer

 

Read

 

 

 

 

 

178-183

Analog channel 1 time record

Time

 

Read

 

 

 

 

 

190,191

Analog channel 2

4-byte float

0-100 percent

Read

 

 

 

 

 

192

Analog channel 2 status code

16-bit integer

 

Read

 

 

 

 

 

193-198

Analog channel 2 time Record

Time

 

Read

 

 

 

 

 

205,206

Analog channel 3

4-byte float

0-100 percent

Read

 

 

 

 

 

207

Analog channel 3 status code

16-bit integer

 

Read

 

 

 

 

 

208-213

Analog channel 3 time record

Time

 

Read

 

 

 

 

 

220,221

Analog channel 4

4-byte float

0-100 percent

Read

 

 

 

 

 

222

Analog channel 4 status code

16-bit integer

 

Read

 

 

 

 

 

223-228

Analog channel 4 time record

Time

 

Read

 

 

 

 

 

235,236

Analog channel 5

4-byte float

0-100 percent

Read

 

 

 

 

 

237

Analog channel 5 status code

16-bit integer

 

Read

 

 

 

 

 

5-8