B&B Electronics MAP450D - Manual (Page 9)

2.1. RS-232 (Interactive & Block modes)
Interactive and Block modes support the 3-wire RS-232 configuration with TXD,
RXD and signal common. The cable requires an overall shield to protect against
electrical noise. Xon and Xoff can be used for communication handshaking.
3-Wire RS-232
Host Controller MAP450D Terminal Block
TXD Pin 9 - RXD
RXD Pin 10 - TXD
Signal Ground Pin 8 - Return
2.2. RS-422/485 (Interactive & Block modes)
Interactive and Block modes support the 3-wire and 5-wire RS-422/485
configurations. The 3-wire configuration has both transmit and receive on the same
pair of wires plus a signal common. The 5-wire configuration has differential signal
pairs for transmit and receive plus a signal common. In both configurations the
signal pairs must be twisted and surrounded by an overall shield.
NOTE: When using 3-wire RS-422/485, Jumper JP4 must be in position “B”.
Refer to section 2.4 for instructions.
3-Wire RS-422/485
Host Controller MAP450D Terminal Block
TXD+ & RXD+ Pins 4 & 6 - RXD+ & TXD+
TXD- & RXD- Pins 5 & 7 - RXD- & TXD-
Signal Ground Pin 8 - Return
5-Wire RS-422/485
Host Controller MAP450D Terminal Block
TXD+ Pin 4 - RXD+
TXD- Pin 5 - RXD-
RXD+ Pin 6 - TXD+
RXD- Pin 7 - TXD-
Signal Ground Pin 8 - Return
INSTALLATION MANUAL 9
1010-0046A, REV 00