GIR1002 FR / GIA1000 FR Connecting and Operating Manual Version: 4.03-3 page: 12
RS485 interface
The serial interface of the GIR1002 FR allows communication of the device with a host computer. Data
polling and transfer is done in the master/slave mode, i.e. the GIR1002 FR will only transmit data upon
request. A separate device address can be attributed to each GIR1002 FR. Addresses 0 to 15 are
implemented. The GIR1002 FR will respond when requested to do so by the host, provided the device
number of the request string corresponds to the one set (response of GIR1002 FR 20 to 60ms after
request has been completed). This method as well as the fact that the interface operates in the half-
duplex mode ensure that up to 16 devices can be called via only one 2-wire line.
Interface configuration
Type
RS485
Transfer mode
half-duplex
Connection
2-pin screw/plug-in connection
Connecting cable
2-pin, twisted.
Data transfer format:
2400 Baud
1 start bit
7 data bits
no parity bit
1 stop bit
Communication is entirely achieved by means of printable ASCII code.
Data transfer processing protocol
Request data from GIR1002 FR
Request string to GIR1002 FR:
!
Nr.
Nr.
F1
F2
/
Byte
1
2
3
4
5
6
Response from GIR1002 FR:
#
F1
F2
$
D1
D2
D3
D4
/
Byte
1
2
3
4
5
6
7
8
9
Send data to GIR1002 FR:
Send string to GIR 1002 FR:
!
Nr.
Nr.
#
F1
F2
$
D1
D2
D3
D4
/
Byte
1
2
3
4
5
6
7
8
9
10
11
12
Response from GIR1002 FR:
#
a
/
if data habe been successfully taken over
Byte
1
2
3
