Applied Motion TXM24Q-1AG - Manual (Page 14)

14
Rev. D
920-0087
TXM24 RS232/485 Hardware Manual
Two-Wire Configuration
In a 2-wire system, the host must disable its transmitter before it can receive data. This must
be done quickly before a drive begins to answer a query. The TXM24 includes a transmit delay
parameter that can be adjusted to compensate for a host that is slow to disable its transmitter. This
adjustment can be made over the network using the TD command, or it can be set using the Step-
Servo Quick Tuner software. It is not necessary to set the transmit delay in a four wire system.
NOTE: If the PC does not have an RS-485 serial port, a converter is required.
You can contact Applied Motion Products to buy a USB to RS-485 converter.
Assigning Addresses
Before the entire system is wired, each drive will need to connect individually to the host computer
so that it can be assigned a unique address.
Once the drive has been connected to the PC as described above, launch the Step-Servo Quick
Tuner software. Apply power to the drive. If a drive has already been configured, click the Upload
button so that the Step-Servo Quick Tuner settings match those of the drive. When operating the
drive in SCL mode it will need to be assigned an address. This is done on the Drive Configuration
tab where a list of address options can be seen. The numerals 0..9 or the special characters ! “ #
$ % & ‘ ( ) * + , - . / : ; < = > ? @ may be used as addresses. Make sure each drive on the network
has a unique address. On a 2-wire network, the Transmit Delay may also need to be set. Most
adapters work well with 10 milliseconds. Once the address has been assigned, click Download to
save the settings to the drive.
to PC GND
to PC TX- (A)
to PC TX+ (B)
120Ω
Drive #1
GND
TX-
Drive #2
GND
TX- TX-
TX+
RX-
RX+
Drive #3
GND
TX+
RX-
RX+