Red-lion TCU User Manual download pdf (Page 43)

In practice with the cooling output, observe the controlled temperature

characteristics and if the temperature remains above setpoint with a sluggish

return, increase the cooling gain. Similarly, if the temperature drops too

sharply with an overall saw-tooth pattern, decrease the cooling gain. Alter the

heat-cool overlap until a smooth response in the controlled temperature is

observed during band transition.

Serial Communications Module (6-SC) (Optional)

When communicating with a TCU unit via the serial port, the data formats

of both units must be identical. A print operation occurs when the user input,

programmed for the print request function is activated, when a “P” command

is sent via the serial communications port, or after the time expires for the

automatic print rate, if enabled. Serial communication is covered in detail in

RS485 Serial Communications, page 48.

Baud Rate (bAUd)

The available baud rates are:

300, 600, 1200, 2400, 4800, or 9600

Parity Bit (PArb)

Parity can be odd, even, or no parity.

Address Number (Addr)

Multiple units connected on the same RS485 interface line must each have

a different address number. A value of 0 does not require the address specifier

command, when communicating with the TCU. The address numbers range

from 0 to 99.

Abbreviated or Full Transmission (Abrv)

When transmitting data, the TCU can be programmed to suppress the

address number, mnemonics, units, and some spaces by selecting YES. An

example of abbreviated and full transmission are shown below:

NO - 6 SET 123.8F<CR> <LF> Full Transmission

YES - 123.8<CR> <LF> Abbreviated Transmission

Print Rate (PrAt)

The TCU can be programmed to automatically transmit the selected print

options at the programmed print rate. Selecting 0 (zero) disables the

automatic print rate feature.

PrAt - 0 to 9999 seconds

Figure 20, Heat/Cool Operation (db<0)

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 103 104

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Red-lion TCU User Manual Page 43