AMX Modula Instruction Manual page 146

RS-422 Boards
RS-232 Pinout for DB-9 Connector
If RS-232 cable is used it must be a null modem cable (no hardware flow control).
RS-232 Pinout, Toggle Set to CTL
FIG. 96
RS-232 when toggle switch is set to CTL
RS-232 Pinout, Toggle Set to DEV
FIG. 97
RS-232 when toggle switch is set to DEV
RS-232 Voltage Compatibility
TX Recommended (max.) Voltage
TX Absolute (max.) Voltage
RX Recommended (min.) Input Voltage
Note: RS-232 cable length and data rates are limited by the connected RS-232 equipment.
140
When a controller is attached, use the cable pinout in FIG. 96 and set the toggle switch on the
board to CTL.
When a device is attached, use the cable pinout in FIG. 97 and set the toggle switch on the
board to DEV.
+12 V, -8 V
+15 V, -10 V
HIGH ≥2.5 V
LOW <1.0 V
Modula Instruction Manual