Matrix Orbital VK204-25 Legacy - Manual (Page 11)

complies with the EIA-232 standard in that it uses signal levels from +/- 3V to +/- 12V. It will not operate
correctly at TTL (0 to +5V) levels.
Table 4: RS-232 Pinout
Pin Number Direction Description VFD Host
2 Data from VFD Data out Tx Rx
3 Data to VFD Data in Rx Tx
5 - Ground gnd gnd
2.1.5 Configuring RS-232 and I 2 C
RS-232 baud rate and I 2 C address are configured by means of jumpers.
Figure 9: RS-232 Jumpers
The module is supplied with jumpers J1 and J2 installed, which gives an RS-232 baud rate of 19200 and
an I 2 C address of 0x5C.
• RS-232 port: J0, J1, J2 - control baud rate. RS-232 format is 8N1 (8 bits, no parity, one stop bit)
• I
2 C port: J0, J1, J2, J3 - sets slave peripheral address
Matrix Orbital VK204-25 8