Matrix Orbital GLC24064 - Manual (Page 15)

Table 4: RS-232 Pinout
Pin Number Direction Description LCD Host
2 Data from LCD Data Out (LCD) Tx Rx
3 Data to LCD Data In (LCD) Rx Tx
5 - Ground gnd gnd
2.2.2 RS-232 Communication through the Power Connector
RS-232 communication can also be achieved through the middle two pins of the power connector.
Figure 14: Power Connector
Table 5: Connector Pinout
Pin 4 Vdc
Pin 3 Tx
Pin 2 Rx
Pin 1 Ground
To allow this, the jumpers must be set as indicated below.
Figure 15: RS-232
Matrix Orbital GLC24064 11