Rice-lake 880 Performance Series Indicator/Controller Techni Uživatelský manuál stáhnout pdf (Strana 104)

98 880 Technical/Service Manual

10.6.3 RS-485 Data Formats

The 88

0 has a built-in RS-485 software protocol which is enabled when configuring a port’s TYPE as 485. On the

880 only the COM port has hardware support for RS-485 communication.

All RS-485 communication with

the 880 is via command and response. An external host must send a command

and wait for a response.

All remote commands are initiated using the data

format shown in Figure 10-2:

ASCII 02

decimal

Address of the

receiving indicator

valid range - 0-255

EDP serial command

NOTE: Host must send <CR>, not

<CR><LF>. Failure to use <CR>

renders all indicators unable to

respond to serial commands

ASCII

13 decimal

Figure 10-2. RS-485 Send Data Format

If the initiating device address matches the port address of a 880 on the RS-485 network, that indicator responds.

The responding indicator uses the format shown in Figure 10-3:

<STX>

ASCII 02

decimal

Address of the

transmitting indicator

Response commands from

indicator:

<ﬁrst line><EOL>

where EOL = <CR> or <CR><LF>

(set by TERMIN parameter on the

SERIAL menu)

ASCII 13

decimal

ASCII 3 decimal

Figure 10-3. RS-485 Respond Data Format

• Communication with an RS-485 880 is command / response only. An 880 configured for RS-485 cannot print a

ticket or stream continuous data.

• Any valid EDP command can be sent to the 880 when in RS-485 mode.

• If a command is unrecognized or cannot be executed,

the 880 responds with ?? wrapped in the RS-485

protocol. For example: <STX><ADDRESS>??<ETX><CR>

• Depending on the command, the <RESPONSE> may include its own termination characters that are sent

before the <ETX><CR>, see the example for the XG command shown below.

• A multi-line response, for example from a DUMPALL command,

is wrapped in the header and footer as a total

but each individual line is not.





Where:

EOL - <CR> or <CR><LF> (set by the TERMIN parameter

for the port)

1 2 ... 99 100 101 102 103 104 105 106 107 108 109 ... 119 120

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