5
2.2
Serial interface
The RLI20 outputs RS485 serial data at 2.5 Mbps.
Cabling
A screened twisted pair is recommended with SD+/SD- as one
pair 0 V/5 V as second pair and outerscreen as chassis. The
connection on the RLI20 is a 9 way male D-type, the mating
connector is shown in Figure 2. Pinouts are show in Table 3.
5 V power from the controller is needed to detect when the
controller is switched on or power cycled.
Table 3 – Serial interface pinout
Pin
Function
2
REQ+ / SD+
3
REQ- / SD-
4,5
5 V power from Panasonic controller
8,9
0 V
Shell
Chassis
1,6,7
Not connected
Installation
9 way D-type
31
16
52
Figure 2 – 9 way female D-type connector