Figure 1: The Repeater (A2058).
The Repeater (A2058) is a LWDAQ Repeater whose function is to re-transmit signals sent from the LWDAQ driver to a LWDAQ device and turn off the power to multiplexers and devices.
The A0258 connects directly to a driver socket with a root cable. The shielded connector on the A2058 is the one that receives the cable. The un-shielded socket receives another root cable that can go to a multiplexer or a device. When the driver transmits device address zero to the repeater, the repeater turns off power to the second root cable, thus turning off power to any multiplexer or device at the end of the second root cable.
Looking at the Repeater with the writing on the board in an upright fashion, plug the cable from the driver or multiplexer into the left side connector, and plug the cable going to the device into the connector on the right side of the board. The Repeater, by default, acts transparently by repeating command words and keeping the power on. If the user would like to turn the power off to a device connected to the repeater, one must transmit an address word with bit 1 set to a value of 1. To turn the power back on, set bit 1 to a value of 0. For an example of how a driver might be instructed to make such an address transmission, see the appropriate section of the LWDAQ Driver (A2037) manual.
The A2058A provides no connection between the J1 shield and the local 0-V. The LWDAQ specification recommends that the J1 shield and 0-V be connected by a 10-nF capacitor.
We picked an A2058 at random and measured its power consumption in two states.
| State | +15 V | -15 V | +5 V |
| Power Off | 0.35 mA | 0 mA | 7 mA |
| Power On | 0.35 mA | 0 mA | 7 mA |
Note: All our schematics and Gerber files are distributed under the GNU General Public License.
The A2058 circuit is very similar to that of the LWDAQ Multiplexer in that it uses the same LVD transceiver and address receiver. The A2058 uses an unused bit in the address word to turn on/off the +5V,+-15V voltage supplies to any device connected to it.
The A2058 functions as a command word repeater. It receives and retransmits command words sent from the driver to the device. It is important to note that the A2058 restores signal loss of the command word, but does not restore power loss due to transmission line length.
Here are the two pages of the A2058 circuit diagram:
Page 1: LVDS TransceiverPrinted circuit board files: A205801C