TV One 1T-C2-100 Specifications download pdf (Page 55)

1T-C2 SERIES OPERATION MANUAL

10 RS232 / IP CONTROL SPECIFICATION

PLEASE NOTE: Not all units support RS232 and/or IP (Ethernet) communications

– check to see if this feature is present on your unit.

This section outlines how to control a unit via an RS232 or Ethernet link (if fitted to

your unit), using ASCII-based commands. It details how to send and receive serial

data to perform many of the functions that a user has access to on the unit.

Not all units will support the full range of adjustments listed – this will depend on the

complexity of the unit you have.

10.1 Communication protocol basics

Packets of ASCII data containing hexadecimal numbers are exchanged between

the unit and controller via an RS232 or IP link (you cannot use both at the same

time).

The RS232 standard is 57600 baud, 8 bits, no parity and 1 stop bit, although this

can be changed by the user (see ‘System’ menu).

No flow control is used - however all control packets start with an ASCII 'F', end

with carriage-return (13 decimal, 0x0D hexadecimal) and all such packets sent to

the unit will be acknowledged (thereby provided software handshaking). Note that

a line-feed (LF) should not be sent.

It may take around 30ms (0.03 seconds) for an RS232 command to be actioned

and acknowledged – this will vary between different models.

ASCII-hex data is used where a number is encoded into its hexadecimal equivalent

with leading zeros – e.g. Where '00' is decimal value 0, '80' is decimal 128 and 'FF'

is decimal 255. In other words, two characters are sent for each byte encoded.

Any gap of more than 1 second between the characters of a control command sent

will cause a time-out - and previous characters sent will be lost.

Write packets (sending command functions to the unit) are always 20 characters

long (including a carriage return at the end). The unit will respond with a full 20

character message indicating what has changed. This returned payload will reflect

the actual value of the parameter changed. If the user requests a value out of

bounds then the limit value is used, and the payload will then reflect the limited

value used.

Read packets (sent to request information from the unit) are always 14 characters

long (including a carriage return at the end), the response from the unit will be a 20

byte message with the Write flag (since it is ‘writing’ the value back to the host) and

the ACK flag set.

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TV One 1T-C2-100 Specifications Page 55